What is the best kind of phone to use with my Ultra Mobile service?

To use our network, you will need an unlocked GSM phone that supports one or more of the following frequencies:

• 1700/2100 MHz (3G / 4G or LTE depending on location)
• 1900 MHz (2G or 3G / 4G depending on location)
• 850 MHz (2G)

For the best experience, you should get a phone that supports the 1700/2100 MHz frequency. This will ensure that you get the fastest possible data speeds on our nationwide network.
If your phone supports 1900 MHz, you’ll be able to get 3G/4G data speeds in some parts of the country, but not nationwide.
If you only need voice, text, and our slowest data speed, you may use a device that supports 850MHz but none of the other frequencies listed above.
Most US phones are sold as tri-band or quad-band phones that include one or more of the frequencies above.