Skype Promoting Mobile Usage

I got the following email from Skype this morning trying to encourage me to claim a "Skype to go" number and use Skype on my mobile phone.

The problem is that while there's a financial incentive to use Skype for international calling the quality isn't good enough yet for every day domestic calling over 3G. If that quality improves as 4G networks roll out there could be increasing use of Skype as a primary telco on mobiles.

However Skype can be used quite nicely on the iPad to turn that device into a phone. 

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That sort of potential disruption is a reason that most carriers won't offer unlimited data-only plans.