3G router with built in SIM support and WIFI hotspot support

Friends, I am looking for a full proper router with built in support for 3G SIM. There are many router available but all I find is that they support 3G sim only through external dongle i.e USB modem but I want WIFI Router with 3G built in to it. I even purchased one online but when I received I got to know that it only support 3G through USB modem but was not explained properly in online specification.

So please suggest me 3G router with WIFI , I don't want dongle but only want proper Router.