I have an eons old Nokia with a tesco pay as you go sim card.(I`m last of the dinosaurs) I want to upgrade to a more modern pay as you go with e mail etc. Can I keep the same simcard ie phone number? Been offered an unlocked Iphone cheap but not sure as running costs are high i`ve been told. I only use occassionally .Went to a mobile shop and the guys looked at me in disgust after trying desperately to sign me up for a contract at £ 40 pm. Sorry for basic question but I just don`t use a mobile often.