Blackberry was always the weird one out that effectively depended on special service from your provider combined with special tariffs for using them. This is a legacy from when they were explicitly enterprise devices and you couldn't exactly buy them normally.
Similarly, the core functionality of the original BB - email - is no longer supported (though you can probably run it still) because the special server software (BB didn't run normal email originally) was withdrawn. This special server communicated with your phone provider IIRC to handle BB-only special features like email (back when GPRS was barely starting)
Similarly, the core functionality of the original BB - email - is no longer supported (though you can probably run it still) because the special server software (BB didn't run normal email originally) was withdrawn. This special server communicated with your phone provider IIRC to handle BB-only special features like email (back when GPRS was barely starting)