The American version of iPhone4 can't get online. With the card, you can send messages and make phone calls.

1. Open Settings-> General->; network

2. Turn on cellular data and data roaming? (GPRS, EDGE and 3G networks will only appear when this switch is turned on. )

3. Enter the cellular data network and set APN.

China mobile APN:CMNET China Unicom APN:3GNET

Troubleshooting:

1. No text interface pops up; If the boot is slow, the pop-up prompt will be omitted or hidden, which will not affect the normal unlocking.

2. Repeatedly prompt "SIM card is not installed": it is because the unlocking process is not synchronized, please turn it off and restart.

3. Always prompt "No SIM", no response: Please check whether the edge of the SIM card is in contact with the chip, if so, please trim it.

4.FaceTime problem: After FaceTim is turned on, the mobile phone will automatically send an international SMS to confirm the registration, so sometimes the registration will be affected because of the delay of international SMS, so you need to make sure whether your number is enabled with international SMS.