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Will the new Ubuntu Phone support VoIP through the operating system when out of range of the network the user has? This would be a great way to steal market share from Apple which doesn't support VoIP except through complicated apps.

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Do you mean VoIP server? – Simplexion Mar 11 '13 at 5:52
Maybe... I am thinking of when people are outside of cell phone range being able to switch on forwarding to VOIP through the network provider being built into the phone and not having to download an app, I know some phones can do it, and some phones can't. I hope Ubuntu will be able to, kind of like how messaging is set up on Ubuntu without having to download anything special. If that makes sense... – stidmatt Mar 13 '13 at 4:56
If they don't have a signal how are they going to connect to the VoIP servers? Will they have wireless internet access? – Simplexion Mar 21 '13 at 23:23
Yes, I was thinking they would have Wireless along with cell phone reception so that it could receive calls when out of range of cell reception but in range of a network. – stidmatt Mar 23 '13 at 0:54
It would be interesting if they supported SIP out of the box, but they wouldn't be taking market share from anyone else. There are a few really good SIP clients for iPhone, Android, etc. – Simplexion Mar 30 '13 at 1:07

It appears as though the default VoIP client for Ubuntu/Ubuntu Phone OS is currently Empathy:

In addition to this, someone else was interested in something similar. Unfortunately, they found that VoIP is not a big feature with the current version of Ubuntu's phone os.

The VoIP client appears to work off of 3G/WiFi - type networks. You may have to start a new call after leaving the range of the cellular network. I don't think it's as automatic as you were hoping for, sadly.

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Ubuntu Phones have been out for over a year now, and currently don't have support for this. I'd love to see an app arrive with support for VoIP, but one currently does not exist. So the simple answer to your question is "no".

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Actually, Google Hangouts does work in the browser on Ubuntu phones now, though Google has not optimized the site for mobile devices, so it is slightly awkward to use. – dobey Jun 28 at 11:47

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