Any barrier for VOIP????......thus, any hope......???

The biggest barrier to entry for this VOIP would be to convince customers that it would be safe and secure. Customers might be reluctant to give out their credit card information through cell phones which might get intercepted and thus exploited. So safety will act as a huge barrier for this new technology. And also the fact of uncertainty of getting together the wireless operators, credit card companies and retailers to work seamlessly would be another biggest concern for the advocates of this new technology.