Can I call landlines and regular mobiles?

Yes - using your SIP account or fringOut account through the fring interface.

Note:If you use an older version of fring, a GSM call uses your current calling plan and therefore will be billed at your regular rate. This option is not available if you don't have a SIM card in your device or using updated version of fring.

See full user guide for your device here

This answer was helpful This answer was not helpful