Just curious, I understand the brute force of Carriers shutting off 2G and 3G, which isn't going to be a BB problem only.
Why would a BB10 OS with 4G capability lose it's ability to send and receive phone calls and text over sim card. ( I realize this could be a bigger problem through ATT sim cards.)
Update; https://www.phonearena.com/news/when...ut-3G_id125233