What if the sticker can't activate imessage (se3)?

If your card reader cannot activate iMessage, you can try the following methods:

1. Check the mobile phone card and card sticker: Make sure that the mobile phone card is correctly inserted into the card sticker and the card sticker is correctly inserted into the iPhone. If possible, try to use another compatible mobile phone card and card sticker to eliminate hardware problems.

2. Restart the phone: press and hold the power button, and then slide the power off option. Wait a few seconds, then press the power button again to start the machine.

3. reset network settings: go to settings > general > reset > reset network settings. This will reset all network settings, including APN, MMS, cellular data, etc. Please note that this will delete the saved Wi-Fi password and VPN settings.

4. Update iOS: Make sure your iPhone is running an updated version of iOS. Go to settings > general > software update to see if there are any updates available. If so, please download and install.

5. Update the card sticker firmware: Make sure that your card sticker firmware is the latest version. The firmware update method can be found in the related forums of official website or card manufacturers.

6. change APN settings: go to settings > cellular mobile network > cellular data network, and then select APN. In APN settings, enter the correct APN settings provided by the operator. You can find these settings on operator official website, or consult other users on related forums.

7. Check carrier support: Make sure that your card sticker and carrier support iMessage function. Some card stickers or operators may not support iMessage. You can consult the card sticker manufacturer or operator.

If the above methods can't solve the problem, you can consider buying another compatible card sticker or changing your mobile phone. In some cases, hardware failure or compatibility problems may prevent iMessage from being activated. Please note that using card stickers may cause problems such as unstable signal and slow data speed. If possible, please buy an unlocked iPhone for a better experience.