I’m just going from memory and casual research on this. So take it with a grain of salt.
Your account information and contacts are on the SIM card in the phone. Even with a factory reset that info is still there. The surest way to do a completely fresh restart is to get a new SIM from your provider, or you can do a SIM card reset through the phones options.
If you just pull out the SIM the phone should still work on wifi, just like a little tablet. You can then connect it with a “hotspot” on your new phone and “steal” it’s data connection.
I will remove my sim can then. I just want to use it as a miniature surface. Thanks for the advice.
It worked! Now I can use it just for what I want. Thanks again.