I'm just going to address this part, as the other has already been answered.
Metro is CDMA + LTE, doesn't use sim cards like GSM. Their LTE phones DO have a similar-looking card, called a UICC card, but it's just for LTE phones (which can also handle CDMA). Some people refer to the UICC cards as sim cards, but it's not the type of sim card you see in non-LTE phones.
If you are with Sprint, and your wife has a "sim" card, what was it for, Wi-Max or something?
Also, while your EVO technically can be "flashed" to another CDMA carrier, it's more complicated than that. I don't know where you live, but in some markets Metro runs their service on AWS frequencies rather than the "regular" CDMA frequencies Verizon and Sprint use. So, phones manufactured for MetroPCS have extra chipsets to handle those added frequencies. If you live in Florida, your EVO could work just fine (if flashed). In places like New York or Phillie, NO. You would never get a MetroPCS signal with your EVO as your phone would not have the right chips inside.
At this point in time, it would probably be better for both of you to get MetroPCS phones. If you don't want new, there is always Craigslist. (That's where I'm about to sell a Metro LG Esteem and 2 Metro LG Optimus.)
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