Difference between M66FB-03-STD and M66FB-04-STD

IoT Modules GSM Module
1

Hi everyone,

I have a question,what is the difference between M66FB-03-STD and M66FB-04-STD? Couldn’t find any doc about it.

Thanks!

2

these two type is compatible PIn to PIN ， but up to now ，M66FB-03-STD is plan to phase out

pls using 04

3

Hello,

Is there OpenCPU support for M66FB-03-STD?
I have tried the upload M66FB-04-STD based OpenCPU application to M66FB-03-STD and got an error.