Not receiving texts on my new phone
I recently switched from an iPhone XS Max to my moms old iPhone 12 Pro Max, which she had cleared. The problem is that I cannot send or receive texts or calls on this new phone, even though I switched everything over. I have not shut down the old phone yet, so that may be why but I am not sure. Also I never switched the sim cards and I don't know if I should. Does anyone know how to fix this? ty
iPhone 12 Pro Max, iOS 16