Through its network, which used SIP protocol, it allowed making low-cost national and international calls and provided customers with an incoming geographical phone number.

Customers were expected to use a client software or a SIP-compliant hardware (a VoIP phone or ATA) to access its services.

SIM cards can be used as extensions in the Team web telephone system or used individually with mobile and landline numbers.

[8] basic accounts receive one free UK or German geographic 'landline' phone number and a voicemail box.

In counter action, Sipgate won an injunction against T-Mobile to bar it from advertising unlimited Internet access via the device.