The "no carrier" message suggests that the PC is getting through so the number is OK.
Don't know AOL but it's related to CompuServe and when I dialled in France I couldn't connnect to the server until I changed the "Network" setting in my Setup from the UK's CompuServe to something else I can't remember now. Had to find this out by dialling the Frence help number; put a strain on my French but the guy was right onto the problem and very helpful.
Of course this info wasn't available on the CompuServe page that gave the Point of Contact numbers that I checked before leaving UK.