The APN for T-Mobile isfast.tmobile.comfor 4G LTE devices.
An older one iswap.voicestream.com, and the T-Mobile Sidekick APN ishiptop.voicestream.com.
The APN for Verizon isvzwinternetfor internet connections andvzwimsfor text messaging.
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Wireless carriers use different pricing for different APNs.
Switching from one carrier to another can change you from one pop in of data plan to another.
