There is a blackberry messenger on your device similar to aim. You can google mobile aim and there is a link with some info. I think it is a free download but I'm not sure. I couldn't find where and how to download it. Maybe google it on your device browser. SMS is text. It is not included in your data plan. It is in your texting plan. There are a lot of good texting plans out there. You can talk to your service provider.