I don't know anything specific about VOIP, or Skype in particular, but I thought I would chime in with some info that may help you.
2.4 and 5.8Ghz refers to the frequency the phone broadcasts at. The main reason they have even come out with 5.8GHz for cordless phones ( and most other devices) is that originally most wireless devices broadcast at 2.4Ghz and since more and more things are wireless these days there can be interference as you, for lack of a simpler term, "fill up" the bandwidth.
So while a 5.8Ghz phone might be a better phone for your situation, since less devices use 5.8 GHz, I fail to see how it will help with VOIP.
However, as I stated, I have little or no idea the requirements for VOIP so if a 5.8 Ghz phone is required (for some reason which I cannot even fathom)then disregard everything I have said.
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