Few routers can capable to get internet connectivity from the 3G USB dongle and as well as ethernet / ADSL cable. With these types of routers if cable internet connection lost, you can get internet connectivity from 3G USB dongle by connecting to the router.
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3G routers allow to connect USB dongle to the router just like how we connect cable connection to router. User can can connect USB dongle as internet connection to the router and use the internet over wifi on multiple devices.
If you are planning to buy a router to use with USB dongle and cable internet connection, please look for terms like 3G router, USB dongle in product specification. Normally USB port in the router is designed for connecting external hard disk or printer. In this type USB port USB dongle won't work. So be careful while purchase router in which you want connect 3G USB dongle. Look for "dongle" or "USB dongle" phrase in product specification or product reviews.
Popular USB service providers are Tata Photon, Reliance net connect, MTS, Airtel. If you are buying new router be sure will it work with existing USB dongle or data card. If you are taking new Data card connection or dongle be sure it should work with your exisitng router or not.