...Nextel. Motorola. etc.? Right now, I have a motorola i730 (Nextel). I want to buy a new phone but I want to use my old sim card. I'm looking at buying a New Motorola V9 on Ebay. Will my sim card work in this phone? Does anyone know if nextel Sim Cards can be used in boost mobile phones or any other brands of phone? Is there an easy to tell what brands of phones you can use an old sim card in.