After return to UK from EU, phone says "Not registered on Network".
Says "Emergency calls only"
Doesn’t send or receive texts or calls.
Had been working fine before visiting EU and while there for 2 weeks.
I’ve tried; closing down and re-starting; enabling Flight mode and returning to normal; enabling mobile data and turning it off; enabling data roaming and turning it off; scanning for available networks and then selecting “3 UK”.
Network signal strength is 2 or 3 bars.
Device is Samsung Galaxy Ace S3 GT-S7275R, running Android 4.2.2.
I am reasonably IT literate having taught it till 5 years ago.
Advice please.