Bought cheap phone and this SIM card for my daughter whose friend's sofa ate her previous phone! Wanted to transfer her old number and credit to this SIM. Regarding other review about finding out the number, just key in *#100# and the number comes up, no need to top up first. Straightforward process to transfer old number and credit to the new one (although I used my own Vodafone phone to do that as I didn't want to buy yet more credit). Well done Vodafone, even if your website couldn't let me buy a phone off you in the first place - Amazon got the business instead. This is an excellent value SIM card.