Setup Network Manager In System Settings for 2 Mobile USB 3G modems
 

I'm running Linux Deepin 12.12 on an Acer Aspire V3-551.
I need to run two different mobile 3g USB modems for my internet access.
If I plug them both in, network manager "sees" them. However, when I try to configure the APN:, dial code, userid and password, whichever one I save last is stored as the one for both.
Appreciate fully explained, step by step instructions. If I am to do this from the command line, need it all shown, and precisely how to find any variables I have to key in.

Thanx in advane

BUMP