Outside the US
There are several cell phone providers outside of the United States that offer reasonable BlackBerry plans, as well as a selection of phones.
For folks living in Canada, there are the three choices of Rogers, Telus, and Bell. All three offer smartphone and data plans, though Telus and Bell seem less expensive, Rogers has a more varied choice of both plans and phones.
For those in the UK, there are six different carriers, including a UK T-mobile, all offering different phones and pricing plans.
When choosing a BlackBerry data plan, it's important to look at not only coverage, but also what you will get for your money. If you aren't going to use the web or e-mail, perhaps choosing a text data plan is worth it; however, if you travel a lot and need to keep in contact with various people (friends, family, co-workers) then getting an unlimited plan is the best choice.
All plans listed are for individual users and do not take into account family plans or those offerings for business. Keep in mind that depending on your business or company, you may also receive a company phone at a discount.