The Signal insurnace I have just sent me a new i730 to replace my broken i95 and I am told that I need to upgrade my all white SIM for a yellow SIM in order for my new phone to work right or it will void my insuance and warrenty 
Well, I put my original SIM card in the 730 and it seems to work just fine, so my question is, do I really need a new SIM? Also, I plan on getting an i58 to use at work only.I will just swapout the SIM when I want to use the other phone. If I have to upgrade to a new SIM for the i730, will that new SIM work in the i58 phone? What are my options here and what is the difference between all the SIM cards?
Well, I put my original SIM card in the 730 and it seems to work just fine, so my question is, do I really need a new SIM? Also, I plan on getting an i58 to use at work only.I will just swapout the SIM when I want to use the other phone. If I have to upgrade to a new SIM for the i730, will that new SIM work in the i58 phone? What are my options here and what is the difference between all the SIM cards?