Not sure if its possible to port an existing mobile number.
But even if possible, VOIP is pretty useless over 3G. So unless you going to be using your IPAD over your WIFI connection at home or in the office its not really going to work very well.
I have a VOIP Number which I setup on a SIP client on my Android phone a while back. It works very well when on my home wifi network. But while out on Vodafone 3G, the latency was terrible.
Klipspringer: Not sure if its possible to port an existing mobile number.
But even if possible, VOIP is pretty useless over 3G. So unless you going to be using your IPAD over your WIFI connection at home or in the office its not really going to work very well.
I have a VOIP Number which I setup on a SIP client on my Android phone a while back. It works very well when on my home wifi network. But while out on Vodafone 3G, the latency was terrible.
I know 2talk can't do it. But I've seen it happen for US/Canada based consumers... Didn't know if there were other providers here that might be able to help.
As far as latency goes, just for testing purposes I downloaded an app called Talkatone which connects to Google Voice. So I have a US based phone number and can make and receive calls to/from the states for free, when I was using that on 3G only it was actually not too bad. Seems like a workable replacement for a mobile phone.
Technically this would be possible, but no providers I know of do it.
2talk are probably best placed to offer a service, as they already have numbers in the mobile range, but they would probably need a whole lot of different interconnects, including SMSC interconnects with other carriers in order to make it work properly.
This is exactly the sort of service I think we might see once LTE is widespread, as it would be quite viable to run SIP over LTE for calling then use another app for SMS (Think Whatapp but connected to an SMSC).
SIP works OK over 3G most of the time, but it no where near reliable enough to run as a calling service replacement.
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