The R58 and R68 series industrial 4G LTE router is integrated with 4G modem and providing a SIM card slot. Users need to install a SIM card to make the router to access internet. But now the ISP(Internet Server Provider) provides 3 kinds size of SIM card.
We use a Standard SIM on the 4G M2M Routers, and it is installed like this:
So when you get R58 or R68 4G wireless router, and buy the SIM cards, please tell the ISP you need Standard Size SIM card to use in M2M Terminals.