in 2019 ATT and others have indicated they would be removing support from the Blackberry phones. If you have a SIM from a working current phone and get SIM adapters if needed , the older BB phone will work on the network. I plugged in my sim from an iPhone into an adapter for a sim that fits the Z10 and it worked well.
Can somebody tell me how to start a thread. I used to be able to but that was a long time ago. Now when I go to "Thread Starter" in any forum, the page just blinks and nothing changes.