You can either add a leaked version, there are links to a bunch of them around here, wait a few weeks for the Verizon official version, or you can doanload crunchsms for free from the blackberry app world. I use it and it works fantastically, just be sure to go into options>security options>firewall>and block incoming sms so that your not recieving the same message twice.
or if your looking for a threaded sms text app that works amazing, i reccommend crunchsms downloaded on blackberry app world. It in a way gets rid of the 160 characters thing and u can continuously write and ill send in multiple messages to ur recipients.