VM runs on sprint towers, while ST runs on any of the big 4 carriers depending on which phone you choose. You can also bring your own GSM device and pick either T-Mobile or AT&T and run on their towers. I don't think ST allows usage of LTE networks, but will allow you to use the HSPA+ networks. ST promotes unlimited data, but it's really not and it's kind of wonky. They ban streaming and tethering, and there's a daily cap as well as a monthly cap, though the monthly cap isn't concrete. People have found ways to avoid these caps by changing proxy settings or something along those lines, but I wouldn't push it with high monthly usage.
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