A:AnswerThere is a slot for a MicroSD card inside the back of the phone. You won't be able to "hot-swap" it out for other cards as you'll have to remove the battery to put the card in or take it out. The max supported MicroSD card is 128Gb.
A:AnswerThe most common meaning is that you can't use it with another company. Some phones can be "unlocked", which lets them be used with other cell phone companies. That lets you shop for a better deal or better service as long as you aren't in a contract.
A:AnswerNo, not at all. Sprint/Boost devices will not work on T-Mobile/AT&T or US Cellular devices. CDMA networks work differently than GSM networks. There are however some unlocked devices that handle both frequencies, but this device does not.
A:AnswerGoogle Maps does not appear to be available on the Windows App Store at present. There are GPS apps and you can download specific maps to the phone for each GPS app individually. However, some maps can be quite large in size and may quickly consume the few GB of storage the phone has left.