Dealing with dumb customers can get tricky especially when they’re also angry and unwilling to follow directions! This ...
[Jason Gin] wanted to reuse the SIM card that came with a ZTE WF721 wireless ... All [Jason] had to do then was put the SIM in his phone and punch in the sniffed PIN when prompted.
insert it in the SIM tray pinhole, and press gently until the tray pops out. Most devices just have a single SIM card slot, but some might also have a spot for a MicroSD card and/or another SIM ...