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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.