If you make a non-SSL http request to the SSL https port, your ISY will reject that request. It's not your Blackberry's fault.
HTTP and HTTPS don't just specify ports. They are URI schemes that tell the browser (client) and the server how to connect. When you connect to 443 using http you are getting the port right, but the URI scheme wrong.
Also, your carrier might not be blocking all "non-standard" ports. It may just be using those ports or reserving them for something else. If you wish to use something other than 80 or 443, I recommend using a port higher than 1024 and lower than 49152.