Cellular voice isn't VoIP for CDMA, GSM or W-CDMA. Depending on the carrier it may be VoIP in the backbone part of the network, but the critical part over the a

Cellular voice isn't VoIP for CDMA, GSM or W-CDMA. Depending on the carrier it may be VoIP in the backbone part of the network, but the critical part over the air is circuit switched voice traffic. This changes with LTE, which is the first all IP wireless standard. So what do you get with cellular voice that you don't get with VoIP over cellular data? For one thing, when a voice call is set up it will get guaranteed resources with a delay guarantee, so your call will not be dropped so easily and the number of lost and late packages is minimized. Also, when doing handover to a new cell tower you'll be prioritized to minimize dropped calls. For LTE, the carriers will likely offer voice plans that have similar characteristics. So your VoIP traffic will be prioritized compared to normal data. If you run a normal VoIP client, you'll have the same prio as data traffic, which will give you more dropped calls, lower call quality due to dropped or late packets etc. That's how the carriers can compete. Is it worth to pay extra for? That depends. In some areas where the networks are congested, you may not get a call through on normal VoIP while it would work perfectly on the carriers voice plans.