SWG30XX-4S card position switching

一: SWG30XX-4S usage scenarios
Sim card has a call time limit, after the sim card call time is used up, the device can automatically switch a another sim card to continue calling without affecting the use; Sim card has a call count limit, after the sim card call count is used up, the device can automatically switch a another sim card to continue calling without affecting the use.
二: The difference between SWG30XX and SWG30X-4S
SWG30XX-4S
A,B,C,D four card slots match with a module, only one of these four cards can be used at the same time. When call time of sim card in slot A is used up, you can use sim cards in B,C or D without swapping sim cards manually.

SWG30XX
One card matches with one module.

三: Port Switching Policy

Please refer to this manual  Card switching strategy – how to make the sim card switch according to your expectations