For some reason a week or 2 ago the phone just stopped being able to send sms messages - which is most frustrating. It sends and receives calls, receives texts, but just will not send. I have a Samsung SIII, modded with CM13. Using Vodafone carrier
Had a look at the SMSC settings on CM13. The SMSC number refreshed as 069146620006f0. I tried updating the SMSC number to +6421600600 but it didn't seem to like the "+". I since have found that the SMSC number is in PDU format.
Not sure if the issue is with the phone, CM13, or maybe even the SIM card?