Are you saying that SIM900A would not be compatible with systems except China and India? All SIM900x say they are quad-band. But I notice that SIMCOM does not show SIM900A any more on their website.
Other SIM900 modules I use do not have the letter after 900. They seem to work fine on AT&T.
Search found 3 matches
- Thu Sep 25, 2014 12:06 am
- Forum: Open Hardware
- Topic: ATK-SIM900A-V13, no signal
- Replies: 6
- Views: 25156
- Wed Sep 24, 2014 11:55 pm
- Forum: Open Hardware
- Topic: ATK-SIM900A-V13, no signal
- Replies: 6
- Views: 25156
Re: ATK-SIM900A-V13, no signal
AT+CPIN?
+CPIN: PH-NET PIN
+CPIN: PH-NET PIN
- Tue Sep 23, 2014 9:20 pm
- Forum: Open Hardware
- Topic: ATK-SIM900A-V13, no signal
- Replies: 6
- Views: 25156
ATK-SIM900A-V13, no signal
I just received a new ATK-SIM900A unit and have been unable to get it to join any carrier network. I am experienced SIM900A user. M y setup: * ATK-SIM900A-V13 * External 6V DC 2.0A power supply * T-mobile or AT&T unlocked SIM. Both work in SIM900 based Arduino shield or in phone I have set up fixed ...