Sure4G Voice and SMS

The Sure4G network uses VoLTE technology for voice calls and SMS services. If calling between Sure4G handsets or calling landlines, VoLTE technology will usually give better voice quality and quicker call set up times. Handsets must be VoLTE compatible and network certified to use VoLTE technology.

How do I know I’m using VoLTE?

If your handset is connected to the VoLTE network it displays a VoLTE symbol in the top line of your handset display. They vary slightly but generally look like the examples below. Some handsets show the letters HD to indicate VoLTE instead.

What Handsets can I use

The majority of handset vendors only open their handsets for VoLTE once network certification testing of their devices has been undertaken on a carrier’s network. VoLTE certification is required for voice and SMS services. Sure work with Apple and Samsung to ensure a wide variety of handsets are Sure4G compatible.

Apple

iPhones using iOS15 are fully Sure4G compatible and support data, voice and SMS. iPhones using iOS14 or earlier support voice and data but they do not support SMS. iPhones must be version 6S or newer to work on Sure4G.

Samsung

Samsung handsets including the S21 family and the S22 family are fully Sure4G compatible and support data, voice and SMS. Some A-series models have been activated with more to follow over the next few months. Check with the Sure team for updates on when the different models will be activated.

Other Vendors

We know that some handsets from other vendors are fully Sure4G compatible and support data, voice and SMS. We don’t have a definitive list for handsets from other vendors.

Can I use the Samsung handset I’ve purchased from Sure?

Certain models of Samsung handsets sold by Sure are now Sure4G VoLTE compatible. Please speak to our team and they can advise on the specific models.

eSIMs

eSIMs are now available, for more information click here.