Cant send texts, cant find smsc number setting

[mafidufa]

So a week ago my phone stopped sending texts and at the same time started putting US area codes in front of all my numbers. I managed to get the area code thing to stop by turning off assisted dialing. Then I went looking for the sms centre number to see if that got messed up as well. But there is no sms centre option in the message setting menu. Any ideas?

My phone is G900V unlocked, rooted with Safestrap and SuperSu. Android 4.4.4 stock NK2. I am using a non-verizon simcard in Kenya, and texts had been working fine for the last year with the same sim card. I receive texts just fine.

Edit: I guess what I'm asking is:
1. How can I edit the sms centre number on a stock G900V

OR

2. If I switch to to a custom rom like Alliance, will I be able to set the sms centre number?

 

[ChrisAGilbert]

I'm having a similar problem. Only I run MOAR on my Verizon s5 and I have a TIM simcard in, as I live in Italy. I know this is an old thread but maybe a bump will help. I dled advanced signal status and tried that way, with the TIM smsc number, but that didn't seem to help.