SMS won't send from Alcatel 1X

[ADB57]

I have been unable to send SMS from my Alcatel 1X since switching it off, and then on again. I am able to receive texts.

Within the Messaging app, I select Settings, then Advanced. At the bottom of the screen it says Phone number 07802-092035. This is the SMS message centre number for O2 PAYG.

HOWEVER

When I dial *#*#4636#*#*, and go to Phone Info, there is nothing listed behind Phone number. I would assume that would display the actual number for the phone, as the SMSC number is listed further down the list of information.

Another oddity is when I go into the phone's Settings and select Network & connection, Mobile Network,  then Access Point Names, it displays O2 Pay Monthly, which is NOT the service I use; I'm on Pay as you go.

Pay Monthly has a different SMS service centre number, but using that still does not enable me to send SMS.

[pgn]

Will it accept 0044?

Some phones have a setting as to which format they accept and display, ie full DDI +44nnn... or local 0044nnn... - not sure where that would be in your phone though.

[ADB57]

Sorry, that doesn't make any difference. When I got this phone, there appeared to be problems with the settings which have not been ironed out. Thank you for your help.

[pgn]

One further thing to check - what country does your phone "think" it is in?

https://www.devicesfaq.com/en/change-language/alcatel-1x

[ADB57]

That link is about languages. The phone thinks it is in the country it is actually in - checked that on the settings.

[pgn]

Yes, but that setting in turn drives this one, within the messaging app:

If nothing else, make sure you have a good backup and reset the phone, start from scratch?

[ADB57 · Accepted solution]

I think it'll have to be a hard reset. Many thanks for your efforts.