GTIUTLTMO APN

You must add a new APN from the phone settings and fill in each field as described below:

Name: GTIGLOBAL
APN: wholesale
Proxy:
Port:
Username:
Password:
Server:
MMSC: http://wholesale.mmsmvno.com/mms/wapenc
MMS proxy:
MMS port: 8080
MCC: 310
MNC: 260
Authentication type:
APN type: default,supl,mms

Please make sure there are no spaces left in each field.

Then save, select the new APN created, and reboot the phone. After rebooting, test the SMS and MMS to verify if the issue was solved, if not let us know to help you further.