I have updated skype on my iphone 4s now its not letting me sign in on my mobile but at home i can use it on my lap top using the same id and password.
I'm having the same problem. I have just a Iphone 4. I noticed now it asks for a microsoft account now too I think their update to the app is whats making it not work. I hope they provide a fix soon its so annoying and my husband is overseas and I really need it to talk to him.