Network Coverage and Technology
At ONSIM, we prioritise call quality and connection reliability above all else.
Our Network Partner
ONSiM SIMs utilize the EE network to provide industry-leading coverage for making and receiving calls across the UK. EE is consistently recognized for its expansive reach and network speed, ensuring you stay connected wherever you are.
Why ONSiM is Different
Unlike many business phone providers that rely on VoIP, SIP, or mobile apps, ONSIM uses traditional GSM/4G mobile networks for voice calls.
Superior Reliability: By using the cellular network instead of a data-reliant app, your calls are less likely to drop or suffer from "jitter."
Crystal Clear Quality: You get the same high-definition voice quality as a standard mobile call, without the lag or delay often associated with internet-based calling.
No App Required: There is no need to have an app running in the background or to worry about your data signal strength just to take a phone call.
Ready to get started?
Experience the reliability of a network-level business SIM today:
Have a question about coverage?
If you would like to check the signal strength in your specific area before ordering, please get in touch:
Phone: 0333 880 4008
Email: support@onsim.uk