APN may work automaticly,then just enable data roaming,or use below steps.
1.Find “Mobile Data Network”on the Setting; press “Mobile Data”;
2.Enable data roaming;
3.Press “Access PointNames(APNS)”; tap the icon in the upper right corner, and then tap “New APN”.
4.APN Settings:
*APN: mobile
Username and password do not need to be entered
5.Tap “OK”to save the settings
