Quick answer: A SIM-card two-way radio uses the mobile network instead of its own radio frequencies. When you press the push-to-talk button, your voice travels over mobile data (4G, 3G or Wi-Fi) to everyone in your talk group. This is often called push-to-talk over cellular (PoC). Because the call goes over the network, range is set by mobile coverage rather than radio range, so teams in different towns or provinces can stay on one channel.
How SIM-card radios differ from traditional two-way radios
- Range: traditional radios reach as far as the radio signal (or a repeater) carries. SIM-card radios reach anywhere there is a usable mobile data signal.
- What you need: traditional radios work on their own, with no network. SIM-card radios need an active SIM, mobile data and a push-to-talk service plan.
- Reliability: traditional radios keep working underground, in remote areas and when mobile networks are down. SIM-card radios depend on network coverage and congestion.
- Set-up: SIM-card radios need no repeater or site frequency planning. Talk groups are managed through the push-to-talk platform.
When to choose which
- SIM-card radios: vehicles and staff spread across wide areas with good mobile coverage, such as delivery fleets, security patrols and field teams.
- Traditional VHF/UHF radios: single sites, mines, construction and places with poor mobile coverage.
- Both: many businesses use traditional radios on site and SIM-card radios for vehicles and supervisors.
To compare traditional radio types, see our guide to digital vs analogue radios.
Next step
See the Smart PTT SIM-card radio range, or request a quotation. SATLEC is based in Krugersdorp, Gauteng. Call 011 660 2237 or email sales@satlectwowayradios.co.za.
