Are all cell phone sim cards the same size?

I want to buy a cell phone but not a new service plan. Would any cell phone do?

Are all cell phone sim cards the same size?
Well...mainly, yes....


http://www.codingworkshop.com/ringtones/...





In addition:


A method and equipment for using two SIM cards with the same MSISDN number in a mobile communication system. To at least one subscriber identifier are allocated at least two identity modules (SIM), of which only one at a time can be registered as active. In connection with location updating it is checked whether the location updating relates to a subscriber identifier to which at least two identity modules (SIM) have been allocated. If yes, it is checked whether the identity module (SIM) concerned is at that particular moment registered as passive, and if yes, it is activated 3and the identity module (SIM) earlier registered as active is deactivated. If the identity module (SIM) earlier registered as active is involved in an on-going call while location updating is being performed using an identity module (SIM) earlier registered as passive, the location updating is rejected or delayed until the on-going call has been terminated.
Reply:yep, sim cards are all the same shape and size. If you buy a brand-new sim card, it will come as part of a larger card - roughly the same size as a credit card - which you then just snap out a small piece, with the gold-coloured chip, and there you go...you have your sim card, ready to use.