The MetroPCS Galaxy GS4 comes SIM locked to MetroPCS, so it is not initially available to used with a SIM from another GSM carrier. You may want to visit the MetroPCS website for all the details around the MetroPCS unlock policy, which states, in part, "Your handset must have had active service for a minimum of ninety (90) consecutive days from the individual phone’s activation date."
The MetroPCS Galaxy GS4 comes SIM locked to MetroPCS, so it is not initially available to used with a SIM from another GSM carrier. You may want to visit the MetroPCS website for all the details around the MetroPCS unlock policy, which states, in part, "Your handset must have had active service for a minimum of ninety (90) consecutive days from the individual phone’s activation date."
Samsung warranties the phone for one year. Both bestbuy and metro pcs also have warranty protection options they will offer you. My s4 has 16gb of internal storage, but the system uses part of that so there is 9.1gb +/- left for the user. Also you can add an external micro SD storage card for more storage. I have a 32gb card in my s4.