iPhone users who want to switch to 3G should first make sure that their phone is compatible with the new technology. If your phone is not, you can still use 2G or 4G LTE networks. To switch to 3G on your iPhone, follow these steps:

  1. Open the Settings app and select General.
  2. Scroll down and select Airplane Mode.
  3. Toggle off 3G support in your phone’s settings and then turn on 3G support in Airplane Mode.
  4. Reboot your iPhone if you have not done so already.