Here's an expansion of mobile competition in the US that comes out of left field, even for us: GameStop as a cellular provider. GameStop Mobile, as it's called, is that rare bird of an AT&T-based MVNO that relies on a bring-your-own-device strategy. As long as your hardware works on AT&T's 850MHz and 1,900MHz bands and isn't locked to another carrier, you can bring any GSM- and HSPA-based phone (or data-only device) and use it contract-free: rates start at anything from a strictly pay-as-you-go $5 through to a $55 monthly plan with unlimited voice and text, if just an anemic 500MB of data. Tablet owners and other dat
