You can download the App Firmen-SMS (uhmmm know German for the registration on the website.) Gives you a SMS capable number from Europe, but I did send test msgs to friends in the US and Canada. Seems to work.
now im starting to miss my ipad 2. i had an app that gave me a free local phone number and allowed you to send sms mms and even make a phone call over wifi they really need to bring something like this over here asap.
I found this, which is a PC based application, which wont work....but surly it could be made to work as the bridge already does most of this...via bluetooth..
Here is a link that lists the addresses to send a text message as an email. Keep in mind that not all of these will work, since quite a few are old companies that have gone through mergers and acquisitions.
Or search for the "MessageGateway - Email to SMS and PIN" on AppWorld or CrackBerry store. You will get this application from the vendor "Sulata".
You need to install and configure this on your BB phone. What this application does is send emails received from a predefined email address to the phone number in the subject live.
You just simple create a special email address for this purpose and configure on your BB phone.
Then from your PlayBook, send email to this email address, type phone number in subject line and send the mail.
There is a new Android app called localphone that allow to make phone calls and send text messages over wi-fi or 3g it just needs to be converted to see if would work.