For reference, here are the SIM card sizes in the market:
(Source: Wikipaedia)
Cellular-enabled Peplink and Pepwave products use the Mini-SIM (2FF) form factor. If your SIM card is smaller, you can increase the size of the card using a SIM card adapter.
Did you know @Alan that a good alternative to a Sim Card adaptor is to get a cheep prepaid SIM Card with the various punch out sizes already cut and just use the size you need? In Australia (as we’d expect most of the world) cellular/mobile carriers and phone shops will have a few of these and some used ones too, they may if you ask nicely give the adaptor to you for free.
Happy to Help,
Marcus 
