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5g

Daughter has a 5g apple phone, and shes just got the contract in her name. Bar having issues with number migration, the sim card that was given to her for her own contract says its 4g. Can she still use this or does she need a 5g sim?Many thanks in a...
Apologies in advance for my lack of knowledge. Daughter always had a pay monthly contract on her grannys account. She has now got one of her own. We want to keep/migrate her old number. Having no luck with 202. Can we do it via the o2 app? I have sav...