'''Follow these steps'''
# Check the list on the System Status page. If the box by iOS Device Activation isn't green, try to activate your iPhone later.
# If asked to enter your password as you activate your iPhone, enter the password. (A password prompt means that Activation Lock might be enabled in Find My iPhone.)
# Restart your iPhone.
# If you're using a cellular data connection, connect to a reliable Wi-Fi network instead.
If you still can't activate, here's how to activate your iPhone through iTunes instead:
# Make sure that you have the latest version of iTunes.
# Check that your computer has an Internet connection.
# Open iTunes on your computer. With the cable that came with your iPhone, connect your iPhone to your computer.
# Wait while iTunes detects and activates your iPhone:
** If iTunes shows, "Set up as New" or "Restore from Backup," it means that iTunes activated your iPhone.
** If an error in iTunes says that the SIM card isn't compatible, contact your carrier.
**