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How an Aging Sprint Device Can Reduce Your Android Phone Bill

In case you hadn’t noticed while wandering the aisles of your local consumer electronics big-box retailer, there is an explosion of mobile virtual network operators hitting the marketplace. MVNOs are telcos that buy capacity from major operators like T-Mobile or AT&T, for example, and sell it on to you. Walmart and América Móvil’s Straight Talk calling product is an example. Here’s how it works: You buy a contract-free SIM card, drop it into an existing, unlocked GSM phone, and then top it up with 30-day expiring funds.



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