Phone function on an Android 16 tablet gone, always say "network busy" I have just received a new Teclast T65 tablet with Android 16. If you google "Teclast t65 iD mobile sim card", you can see:The Teclast T65 (including Max and Plus models) features a dual Nano-SIM tray. It fully supports 4G LTE from UK providers like ID Mobile. Because ID Mobile runs on the Three UK network, the tablet must support Bands 3 (1800MHz) and 20 (800MHz)—which the T65 provides.I inserted the old sim card into the tablet, Mobile data worked but no phone function. I tried all methods such as reboot, even reset mobile network settings. All no use. However, when I insert a O2 sim card and Vodefone sim, they worked no problem. Therefore, it must be problem due to the iD mobile sim.I went to Currys, they say they do not support iD mobile. They told me there is someone from carphone warehouse can give me a new iD mobile sim. I activated the new sim card, problem is the same. I checked the tablet information (see photos). Any help will be appreciated.