Is this still an issue? Extremely annoying when this kind of thing happens. I'm sure you've retyped the username and password in full on each device rather than relying on saved values anywhere and you don't have Caps lock on etc. It's usually down to either a difference that's REALLY hard to spot, or a problem with the cache process on your browser, laptop, website etc. My suggestion is to follow the password reset procedure here, pick a new password and use it on your phone as well.