That's why you get a data plan. WiFI is free, data over 3G you pay for.
For me however I'll stick with standards based SIP accounts. i.e. 'asterisk friendly' systems. Nice if you can bounce around free accounts but the pennies it costs for a normal SIP account is worth it to me. We'll see how VoIP works on the data plans, I have no trouble in Canada but I haven't ventured beyond the fast 3G networks yet. Speed isn't the issue but latency is. For now it works great.
Which SIP and voip provider you use? We are in same location. Im trying to find one that provide quality calls over voip.
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