seek info about external USB 3G dongle

[young707]

Please tell me about External USB 3G dongle?
I have a Asian 7" Android Tablet purchased at Fry's Electronics in San Jose.

Is these External USB 3G dongle operate in GSM quad frequency using AT&T or T-Mobile network?

Can you use these device to get online to the internet? What is the data speed?

 

[young707]

I want to understand how to connect to cellular networks to get online? Thank you.