I'm using it for years.
Onesuite VoIP rates are competitive and its pay as you go, so there are no monthly plans. You just pay for the actual minutes you use.
You can use a softphone (like SJphone, X-lite, etc) to use it on your computer or an ATA device if you don't want your computer to be on all the time.
Check it here -> http:///www.onesuite.com
To call people overseas on their landlines, I'm looking for an internet phone that (in order of priority)
1.) can deal with a very bad internet connection: slow and sometimes even breaking off for a couple seconds [yes, it's my very own, paid-for, legal cable connection, and it sucks... but I guess that's an issue for another subforum...]
=> my dream phone should require a low bitrate and be able to "hold" me for a couple seconds if it doesn't get a signal (rather than hang up) or stuff like that
2.) is as inexpensive as possible per minute (primarily for Germany and, if possible, for the US; I have no interest in "unlimited" offers for $9.95 per month etc. because I don't usually spend enough time on the phone to make them pay off!)
and if possible:
3.) is as reliable as possible
4.) is as secure as possible
5.) uses as few computer ressources as possible (e.g., I'd rather not close down everything else while being on the phone)
6.) doesn't use advertising
... yes, I'd love to have the perfect phone for free... :o) ... but hey, I'm willing to compromise, but I thought I'd rather say what my priorities are.
I'm using Windows XP. I've used Yahoo Messenger for some years, but not only is Yahoo unreliable (in general), but they also can't deal well with bad internet connections. I'm sick of their messages about alleged microphone or speaker problems (of which I have none) and cut-off phone calls.