Most Dongles, MiFi, 4G Routers, what ever you want to call them these days, have an Divert SMS to another Number facility, which is a useful feature for these Devices and a feature not found on Mobile Phones, dive into the Admin Settings and go to the SMS / Text settings and you should find a Setting that allows you to instantly Divert (Re Send) any incoming Text Message to another Sim Number on any Network ie, your normal Phone Number.
The cost of resending the Text is the same as any Text Message Cost so if on PAYG Plan you will need Credit or a Text Allowance in place, for normal Monthly Plans the Text comes out of your Text Allowance and for Data Only Plans (ie no Calls included) these Plans come with a 100 Texts per month which should be more than enough to cover your Monthly Text Divert costs.
