Many smartphone's users are aware of such appication as Fring (fring.com) which is special by SIP services support.
For calls via Fring the GPRS traffic is to be paid. It is counted that 1 munute call via VoIP protole takes an average of 150-250 Kb of the traffic.
Noteworthy that Fring is Wi-Fi-compatable and even can search the hot-spot. So in any free Wi-Fi aria you may call with no traffic charges.
To download Fring application, come into the personal office and once again choose this reference.
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