One free text does the whole job. Nobody can make you sit through a retention call, and the leaving network can't lawfully say no.
Keeping the number → PAC. Starting fresh → STAC.
PAC to 65075 or STAC to 75075, from the SIM you're leaving. Works on every UK network, big or small.
It lands in about a minute with your code and the honest exit picture — any early-leave fee, any phone balance. Valid 30 days.
During official sign-up; they do the actual move.
A little wobble on moving day is normal.
Charges stop from the move date, except what the reply disclosed.
Ring or WhatsApp and ask your question out loud — coverage, switching, a deal you're not sure about, a bill that stalled, a call that smelt fishy. We'll talk it through in plain English.
Calls: standard landline rate (020), usually inside your inclusive minutes. WhatsApp: free on your data. We give general guidance only — we can't open or touch any network account, and we NEVER ask for passwords, one-time codes, banking or card details.