How odd.
*Shrug* well it never occurred to me. I was living in a mobile dead spot, due for a lot of operations and NHS s*it and they kept sending me texts that I never got unless I went shopping. So I bought this 3 mobile phone with wifi calling and a payg sim and texts just appeared on it. Now and again inside this house - which has reasonable 3G outside.. it decides that wifi is better than 3G and uses it as well