NFC (Near Field Communication) lets your phone securely read the tag on your Refill Unit. To sync, simply hold your phone close to the NFC tag on the Refill Unit until the app confirms the connection. Because NFC works at very short range, small differences in phone placement or settings can affect the sync.

NFC connectivity issues are usually quick to resolve and often related to phone settings, device positioning, or temporary interference. Below are the most common causes and step-by-step solutions to help you restore a successful NFC connection and get back on track as quickly as possible.

Note: there are currently two Refill Unit label types in circulation. Newer Refill Units have a QR code (labeled "Camera QR") on the back of the label for backup verification. Older Refill Units don't have this QR code yet — this is temporary and will resolve naturally as older stock is replaced with new labels.

Locating the NFC Antenna By Phone Model

Phone Type	NFC Antenna Location	What To Do If NFC Sync Fails
All iPhones	TOP EDGE of your iPhone	Place the very top edge of the phone directly on the tag and hold it still for 1–2 seconds. If the NFC was not detected: 1. Slide the top of your phone slightly and slowly up/down. 2. Try without a phone case. Note that iPhones can't scan NFC tags while the phone is locked. If the NFC was not detected: 1. Turn Wi-Fi off. 2. Turn Low Power Mode off: Settings → Battery → Low Power Mode → Off 3. Restart your phone. 4. Reinstall the Nerivio app. Still having trouble? Try the QR code: If NFC still doesn't connect after one attempt, the app automatically displays a QR code connection screen — you don't need to look for a separate button. If your Refill Unit has a QR code on the back of the label (the larger code on the left, labeled "Camera QR"), tap Connect with QR code and scan it with your camera. The first time, you may see a pop-up asking for camera permission — if denied previously, go to your phone's Settings to turn on Camera access for the Nerivio app, then try again. If the QR code doesn't scan, you'll land on an error screen where you can retry via NFC or QR code, or tap Get Support to chat with our team. If your Refill Unit doesn't have a QR code (some older Refill Units still in circulation don't have one yet), tap "My refill unit doesn't have a QR code" below the button. This retries the NFC connection. If that attempt also fails, a Get Support button appears, opening a chat with our team. Still not working? Tap Get Support in the app to chat with our team directly from where you got stuck. You can also call us at (937) 637-4846 during office hours: Monday–Friday, 8 AM–8 PM, or email [email protected].
Samsung S21–S25 (Non-Ultra)	TOP BACK AREA, right below the camera	On Samsung devices, NFC can be accidentally turned off. Let's make sure your NFC is turned ON. Please check: Settings → Connections → NFC and contactless payments → Turn ON If you don't see it there, try: Settings → More connection settings → NFC. Hold the top-back of the phone directly on the tag and keep it still for 1–2 seconds. If the NFC was not detected: 1. Slide the top-back of your phone slightly and slowly up/down, allowing 1-2 seconds at each point. 2. Try without a phone case. If the NFC was not detected: 1. Turn Wi-Fi off. 2. Turn Airplane Mode ON → OFF 3. Toggle NFC OFF → ON again 4. Turn Low Power Mode off: Settings → Battery → Low Power Mode → Off 5. Restart your phone. 6. Reinstall the Nerivio app. If your phone presents a message "New tag scanned/collected", just skip it and you are all set. Still having trouble? Try the QR code: If NFC still doesn't connect after one attempt, the app automatically brings up a QR connection screen — you don't need to look for a separate button. If your Refill Unit has a QR code on the back of the label (the larger code on the left, labeled "Camera QR"), tap Connect with QR code and scan it with your camera. The first time, you may see a pop-up asking for camera permission — if denied previously, go to your phone's Settings to turn on Camera access for the Nerivio app, then try again. If the QR code doesn't scan, you'll land on an error screen where you can retry via NFC or QR code, or tap Get Support to chat with our team. If your Refill Unit doesn't have a QR code (some older Refill Units still in circulation don't have one yet), tap "My refill unit doesn't have a QR code" below the button. This retries the NFC connection. If that attempt also fails, a Get Support button appears, opening a chat with our team. Still not working? Tap Get Support in the app to chat with our team directly from where you got stuck. You can also call us at (937) 637-4846 during office hours: Monday–Friday, 8 AM–8 PM, or email [email protected].
Samsung S21–S25 (Ultra)	UPPER BACK, slightly below the camera	On Samsung devices, NFC can be accidentally turned off. Let's make sure your NFC is turned ON. Please check: Settings → Connections → NFC and contactless payments → Turn ON If you don't see it there: Settings → More connection settings → NFC. Hold the top rear of your phone directly on the tag, then slide up very slowly to direct the NFC below phone's camera, until the NFC reader aligns. If the NFC was not detected: 1. Slide the top-back of your phone slightly up/down on top of the NFC, allowing 1-2 seconds at each point. 2. Ensure your phone case isn't too thick or metallic. If the NFC was not detected: 1. Turn Wi-Fi off. 2. Turn Airplane Mode ON → OFF 3. Toggle NFC OFF → ON again 4. Turn Low Power Mode off: Settings → Battery → Low Power Mode → Off 5. Restart your phone. 6. Reinstall the Nerivio app. If your phone presents a message "New tag scanned/collected", just skip it and you are all set. Still having trouble? Try the QR code: If NFC still doesn't connect after one attempt, the app automatically brings up a QR connection screen — you don't need to look for a separate button. If your Refill Unit has a QR code on the back of the label (the larger code on the left, labeled "Camera QR"), tap Connect with QR code and scan it with your camera. The first time, you may see a pop-up asking for camera permission — if denied previously, go to your phone's Settings to turn on Camera access for the Nerivio app, then try again. If the QR code doesn't scan, you'll land on an error screen where you can retry via NFC or QR code, or tap Get Support to chat with our team. If your Refill Unit doesn't have a QR code (some older Refill Units still in circulation don't have one yet), tap "My refill unit doesn't have a QR code" below the button. This retries the NFC connection. If that attempt also fails, a Get Support button appears, opening a chat with our team. Still not working? Tap Get Support in the app to chat with our team directly from where you got stuck. You can also call us at (937) 637-4846 during office hours: Monday–Friday, 8 AM–8 PM, or email [email protected].
Samsung A-series	CENTER of the back of the device	On Samsung devices, NFC can be accidentally turned off. Please check: Settings → Connections → NFC and contactless payments → Turn ON If you don't see it there: Settings → More connection settings → NFC Hold the middle of the phone directly on the tag. Keep it still for 1–2 seconds. If the NFC was not detected: 1. Slide the center of your phone slightly up/down on top of the NFC, allowing 1-2 seconds at each point. 2. Try without a phone case. If the NFC was not detected: 1. Turn Wi-Fi off. 2. Turn Airplane Mode ON → OFF 3. Toggle NFC OFF → ON again 4. Turn Low Power Mode off: Settings → Battery → Low Power Mode → Off 5. Restart your phone. 6. Reinstall the Nerivio app. If your phone presents a message "New tag scanned/collected", just skip it and you are all set. Still having trouble? Try the QR code: If NFC still doesn't connect after one attempt, the app automatically brings up a QR connection screen — you don't need to look for a separate button. If your Refill Unit has a QR code on the back of the label (the larger code on the left, labeled "Camera QR"), tap Connect with QR code and scan it with your camera. The first time, you may see a pop-up asking for camera permission — if denied previously, go to your phone's Settings to turn on Camera access for the Nerivio app, then try again. If the QR code doesn't scan, you'll land on an error screen where you can retry via NFC or QR code, or tap Get Support to chat with our team. If your Refill Unit doesn't have a QR code (some older Refill Units still in circulation don't have one yet), tap "My refill unit doesn't have a QR code" below the button. This retries the NFC connection. If that attempt also fails, a Get Support button appears, opening a chat with our team. Still not working? Tap Get Support in the app to chat with our team directly from where you got stuck. You can also call us at (937) 637-4846 during office hours: Monday–Friday, 8 AM–8 PM, or email [email protected].
Google Pixel	UPPER BACK, slightly below the camera	On Pixel devices, NFC can be accidentally turned off. Please check: Settings → Connected devices → Connection preferences → NFC → ON If you don't see it there: Settings → More connection settings → NFC Hold the center-back of the phone directly on the tag. Keep it still for 1–2 seconds. If the NFC was not detected: 1. Slide the top-back of your phone slightly and slowly up/down and left/right on top of the NFC, allowing 1-2 seconds at each point. 2. Try without a phone case. If the NFC was not detected: 1. Turn Wi-Fi off. 2. Turn Airplane Mode ON → OFF 3. Toggle NFC OFF → ON again 4. Turn Low Power Mode off: Settings → Battery → Low Power Mode → Off 5. Restart your phone. 6. Reinstall the Nerivio app. If your phone presents a message "New tag scanned/collected", just skip it and you are all set. Still having trouble? Try the QR code: If NFC still doesn't connect after one attempt, the app automatically brings up a QR connection screen — you don't need to look for a separate button. If your Refill Unit has a QR code on the back of the label (the larger code on the left, labeled "Camera QR"), tap Connect with QR code and scan it with your camera. The first time, you may see a pop-up asking for camera permission — if denied previously, go to your phone's Settings to turn on Camera access for the Nerivio app, then try again. If the QR code doesn't scan, you'll land on an error screen where you can retry via NFC or QR code, or tap Get Support to chat with our team. If your Refill Unit doesn't have a QR code (some older Refill Units still in circulation don't have one yet), tap "My refill unit doesn't have a QR code" below the button. This retries the NFC connection. If that attempt also fails, a Get Support button appears, opening a chat with our team. Still not working? Tap Get Support in the app to chat with our team directly from where you got stuck. You can also call us at (937) 637-4846 during office hours: Monday–Friday, 8 AM–8 PM, or email [email protected].
Other Android Models	Most of Android phones have the NFC reader in the MIDDLE-TO-UPPER BACK	On Android devices, NFC can be accidentally turned off. Please check: 1. Open Settings 2. Tap the Search bar 3. Type "NFC" 4. Turn NFC ON Start in the center, then very slowly slide upward to allow 1-2 seconds at each point. If the NFC was not detected: 1. Slide the back of your phone slowly up/down and left/right on top of the NFC, allowing 1-2 seconds at each point. 2. Try without a phone case. If you don't see it there, try: Settings → Connected devices → Connection preferences → NFC If you don't see it there, try: 1. Turn Wi-Fi off. 2. Turn Airplane Mode ON → OFF 3. Toggle NFC OFF → ON again 4. Turn Low Power Mode off: Settings → Battery → Low Power Mode → Off 5. Restart your phone. 6. Reinstall the Nerivio app. If your phone presents a message "New tag scanned/collected", just skip it and you are all set. Still having trouble? Try the QR code: If NFC still doesn't connect after one attempt, the app automatically brings up a QR connection screen — you don't need to look for a separate button. If your Refill Unit has a QR code on the back of the label (the larger code on the left, labeled "Camera QR"), tap Connect with QR code and scan it with your camera. The first time, you may see a pop-up asking for camera permission — if denied previously, go to your phone's Settings to turn on Camera access for the Nerivio app, then try again. If the QR code doesn't scan, you'll land on an error screen where you can retry via NFC or QR code, or tap Get Support to chat with our team. If your Refill Unit doesn't have a QR code (some older Refill Units still in circulation don't have one yet), tap "My refill unit doesn't have a QR code" below the button. This retries the NFC connection. If that attempt also fails, a Get Support button appears, opening a chat with our team. Still not working? Tap Get Support in the app to chat with our team directly from where you got stuck. You can also call us at (937) 637-4846 during office hours: Monday–Friday, 8 AM–8 PM, or email [email protected].

NFC Sync Error Messages

If, after scanning the Refill Unit, you encounter any error message, please see the table below and follow the matching steps to troubleshoot:

Message / Issue	Screenshot For Reference	What It Means	What To Do
"Your Electrodes Could Not Be Verified You have exceeded the maximum number of treatments with these electrodes."		This means the electrodes have already been used for the maximum allowed number of treatments.	Replace with a new Refill Unit and repeat the sync process. You can throw away the used Refill Unit in the trash, following your local household waste guidelines if needed.
*"Your Electrodes Could Not Be Verified* Your electrodes are expired."		This means the electrodes are past their expiration date and can no longer be used.	Replace with a new Refill Unit and repeat the sync process. You can throw away the used Refill Unit in the trash, following your local household waste guidelines if needed. You can contact the Nerivio Cares team in case of any questions about expiration date of the Refill Unit.
*"Your Electrodes Could Not Be Verified* Replace with new Nerivio Infinity electrodes and tap your phone on the NFC tag again to sync."		This means the NFC tag could not be verified, likely due to a damaged tag.	Contact the Nerivio Cares team for help replacing your Refill Unit: email [email protected], or use the in-app chat. Please include a screenshot of the exact error message you’re seeing. You can upload it in the chat or email. Do not throw away the faulty Refill Unit, as you may need to return it to the manufacturer so it can be examined.
Spinning wheel and NFC icon		This requires further technical investigation.	Contact the Nerivio Cares team for help replacing your Refill Unit: email [email protected], or use the in-app chat. Please include a screenshot of the exact error message you’re seeing. You can upload it in the chat or email. Do not throw away the faulty Refill Unit, as you may need to return it to the manufacturer so it can be examined.

How to Sync Your Nerivio Infinity Refill via NFC to Start Treatment

Locating the NFC Antenna By Phone Model

Phone Type

NFC Antenna Location

What To Do If NFC Sync Fails

NFC Sync Error Messages

Message / Issue

Screenshot For Reference

What It Means

What To Do