the exhibit is my first sim smartphone and im looking to switch to "top-up card status." i have a metropcs sim for it atm. from my gatherings i presume flashing to another carrier is not necessary as cdma is. i can place a sim from another carrier and start service? doesnt seem realistic. what steps will be necessary and please suggest the best service if you know of. im thinking net10, but they have a 50 dollar activation fee. i dont use the device often and would like to be able to purchase "top-up cards" from local stores when i need data/etc. thanks for yer advice.