In your iOS device › select Settings › Cellular › Cellular Data Network. Enter all the below China Mobile APN information correctly on this Cellular Data page.

Cellular Data:
  • APN: cmnet
  • Username: Blank
  • Password: Blank
LTE Setup(Optional):
  • APN: Blank
  • Username: Blank
  • Password: Blank
MMS:
  • APN: cmnet
  • Username: blank
  • Password: blank
  • MMSC: mmsc.monternet.com
  • MMS Proxy: 10.0.0.172
  • MMS Message Size: 1048576
  • MMS UA Prof URL: blank
China Mobile APN Settings for iPhone

Apn settings tutorial in iPhone: