Provide bridge connection route between different sim card operator Please sent a email or make a call for more information. 

2 ports (G=G,G=C,C=C),One pair of bridge connection, 1BGG/1BGC/1BCC
4 ports (G=G,G=C,C=C),Two pairs of bridge connection, 2BGG/2BGC/2BCC
8 ports (G=G,G=C,C=C),Four pairs of bridge connection, 4BGG/4BGC/4BCC

For example:

A B C D  4 sim cards

A & B belong to one operator X,C & D belong to other operator Y

--B C are pretended to equipment ,
--A want to call D,
--then A call B at first,  then B bridge connection C,  C call D from A,
--Begin the talking between A and D.

A B is GSM900/1800/1900MHz mobile frequency

Contact Person: Jason liu

Tel: +86-13554760049/13428718801

Msn:szrunsunsale03@hotmail.com

Gmail:dugylogic@gmail.com

Ymail:szrunsun@yahoo.cn