Some newer model devices are compatible with all carriers. Newer model phones have been wired to be compatible with both technologies GSM and CDMA for example any Nexus or Pixel device from Google will have both CDMA and GSM radios and work on any carrier on the planet. iPhone 4s and later support GSM.

Mobile devices on any of these networks are supported by us; Ultra Mobile, Ting, Cricket Wireless, Red Pocket Mobile, Mint Mobile, FreeUp Mobile, Good2go Mobile, Pix Wireless, TextNow, Simple Mobile, T-Mobile, AT&T, Republic Wireless, TracFone, h20 Wireless, Consumer Cellular, Metro, Google Fi, Net10 Wireless, Straight Talk Wireless, Virgin Mobile, PureTalk USA or any other virtual network that is powered by AT&T or T-Mobile.

I3Mobile USA is powered by AT&T.

To work on our network, your device has to operate on one of these GSM frequencies:

3G UMTS network - 850, 1900MHz bands

4G LTE network - AWS, 700, 850, 1900MHz bands

If in doubt if a handset is compatible please use the Eligibility tool : Click Here

Verizon is a CDMA carrier, and operates on a different technology than AT&T and T-Mobile (which are GSM). However, you should still be able to use your unlocked Verizon 4G LTE device on AT&T or T-Mobile, as most handsets will be compatible with both carriers' LTE bands.
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