You don't get unlimited "data" with the BlackBerry international e-mail plan. This plan, at $19.99, is an add-on to a BES [$29.98] or BIS [$19.99] feature and ONLY provides unlimited e-mail when roaming internationally. Be warned, if you use your BlackBerry overseas, this feature does not cover web browsing or data transmitted via 3rd-party apps.
In response to your instant messaging query, I suggest you get VeriChat or IM+ (I prefer the former) if you don't want to incur additional SMS charges from using that horrible IM app provided by T-Mobile, courtesy Oz.
Last edited by BuZ : 02-10-2006 at 12:54 PM.