I kept mine and use Wise, but I haven't told them I'm staying here...I kept my uk mobile butbi stopped paying the monthly. Luckily I can still receive sms. Would advise to give those expat phone or 1p phone a Lok. Cos if any probs such as bank fraud that happend to me you'd be in touble as you need codes etc. Sent to the UK phone. And I had to call them as they don't do online calling etc.
it's happening a lot with uk banks, but by law I think now they gotta give 3 months + notice of closure. See a few post where people have literally had their funds frozen!