2 question for help

Projects Networking, Protocols, and Devices
1

Hi all,
i have 2 question

i am using sim900 with At commands

one question is
does the AT+CSQ effects the GSM/GPRS signal or only the network strength signal?

second question
when i use AT+CGREG sometimes i get answer of AT+CGREG 0.0 which means that i cant get a GSM signal.
But if i use instead using AT+CGREG i use AT+CGATT and then i get A gprs and it works fine ,
is there any difference ?

Thanks.

2

I don't know the answer but if you modify your Original Post and add the "Sim900" to your title you may catch the attention of someone who does.

...R