Our SIMs use the EE network to make and receive calls.
As our SIMs use traditional GSM/4G mobile networks for calls, they provide higher reliability and call quality compared to VOIP/SIP/APPs.
To sign up and order your SIM please visit here - Sign up
If you have any questions during the sign up process please do not hesitate to contact our support team by calling 03338804008 or emailing support@onsim.uk.