upgrade old card to 4 gsm modules

Maybe some help?

Have been asked a question,very old G400P card w/ 2 gsm modules, could i buy two new modules, should i buy 4 brand new modules or a whole new PCI/PCI-e card?

06:01.0 Unassigned class [ff00]: Device 1b74:0100 (rev 01)
Subsystem: Device 1b74:0104
Flags: slow devsel, IRQ 74
Memory at fdff0000 (32-bit, non-prefetchable) [size=64K]
Kernel driver in use: opvxg4xx

[7267792.048486] Found an OpenVox G400P: Version 1.0
[7267792.048496] card 0 opvxg4xx: slot 0 is Installed
[7267792.048499] card 0 opvxg4xx: slot 1 is Installed
[7267792.048501] card 0 opvxg4xx: slot 2 is Empty
[7267792.048525] card 0 opvxg4xx: slot 3 is Empty

*CLI> gsm show span 1/2
D-channel: 2/4
Status: Power on, Provisioned, Up, Active, Multiplexer
Type: CPE
Manufacturer: SIMCOM_Ltd
Model Name: SIMCOM_SIM300D
Model IMEI: 3568960302XXXXX
Revision: 1008B13SIM300D32_SST34HF3284
Network Name: IDEA Centertel /Poland/
Network Status: Registered (Home network)
Signal Quality (0,31): 29
SIM IMSI: 26003199480XXXX
SIM SMS Center Number: +48501200777

Pls send me the S/N of the board and gsm modules, i need to check it for more details about your case, then i will give you proper answer.
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Hello,

Module SIMCOM300D was the first version of our GSM card. It went out of production two years ago.

So we suggest you buy a newer edition G400P/E with M20 modules instead.

How do i check S/N of card?