Yes the SIM card provider support NB network, with the same SIM card and the BC660k modul, I get the connection with the NB network, but with the BC65 not.
hi,patrech:
1、Both modules support BAND20, so there is no problem in theory;
2、Do you have a more convenient way to communicate, such as wechat? At present, this problem may need to grab Log for analysis. We need to keep in touch;
3、I suggest you lock in BAND20 and replace an unused SIM card to the BC65; try it again!
hi,patrech:
I think the device may be bound to SIM card, which is common in China at present. Please consult the local SIM card provider and radio network operator.