Hi, recently got a new sim only deal to put on Mifi router. When ordering the id sales agent stated the sim would work in a router.

when I first put the sim in the router it worked and I connected devices to it in the motorhome.

forgot to charge the router and router went dead.

once recharged the sim no longer works and states limited access and cannot connect to the internet.

The APN is correct.

why has it decided not work ?

Thank you