Android or iPhone? and why not have ‘Windows Phone’ as an option?
Technically, this is not a phone; it is iPad (and can’t remember password for Apple ID, so not use the app).
I DO have a Windows Phone, though, bought refurbished from giffgaff. When the iPhone stopped charging battery, I had to transfer the SIM into the Windows Phone to continue to use the Internet Sharing/HotSpot for all the household devices while we are in temporary flat.