simples!!

Hello, Been checking the forums and Gov guidance again to make sure my partner and I are collecting all the right evidence we need for her visa renewal. I've got a couple more quick questions for the forum please. I think they have been answered for similar applications elsewhere on this...

I'm considering buying an iPhone from a non-etisalat retailer. Does anyone know: (a) how much the micro SIM from etisalat costs? (b) if I can purchase the micro SIM only, without having to subscribe to an etisalat 'package'? (c) if I would be able to retain/use my existing number? (Needless...