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Jan 24, 2016 10:52 AM in response to moez786by jason269,Hi, moez786.
Thank you for visiting Apple Support Communities.
I understand you are unable to change which data network you are able to use on your iPhone. If you are unable to make this adjustment in settings, most likely your carrier supports Voice over LTE. Here is more information on the LTE options of your iPhone.
About the LTE options on your iPhone
Cheers
