OHS-SMS

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OHS-SMS

Jonathan
Hello,
Has anyone had trouble configuring sending SMS. My Giffgaff card will not connect, although it works fine on another 3g modem.

Regards
Jonathan.
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Re: OHS-SMS

vysocan
Administrator
Hi Jonathan,

SIM800C is only 2G modem.
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Re: OHS-SMS

Jonathan
Hi
Yes I know sim800c is only 2G. My Giffgaff  has been used on  other 2G modems.
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Re: OHS-SMS

vysocan
Administrator
Is it correctly registered to GSM network?
Does the SIM have no PIN setup?
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Re: OHS-SMS

Jonathan
Hello
   Yes it is registered to o2 Network. And it does not have a pin. In fact another SIM arrived this morning
that was registered ,£10.00 stuck on it, and that does not work either.
Both cards work in my phone.

Kr
Jonathan
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Re: OHS-SMS

Jonathan
In reply to this post by vysocan
Hi
Just tried EE sim as well, that will not register either.(Thats the one out of my mobile by the way)

Kr

Jonathan
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Re: OHS-SMS

vysocan
Administrator
Hello,

on Global tab you can see the status:

It is
- Version of modem.
- if the modem is On.
- if the modem respond to AT commands.
- Network status.
- Signal strength.

All modems are four band, they should work on GSM 2G network in all countries. Not sure what it can be.

One reason would be, if you really have 2G compatible SIM card(s).

And second, stupid question, is the antenna plugged in?
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Re: OHS-SMS

Jonathan
https://community.giffgaff.com/t5/Help-Support/Is-giffgaff-still-running-a-GSM-2G-network/td-p/20876762

And I have tried at least 7 different antenna. Internal and external.

Kr

Jonathan
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Re: OHS-SMS

vysocan
Administrator
This post was updated on .
What do you suggest now?

Can you solder? I tell you how to bypass the UART lines and if you have 3V3
serial you can solder 2 wires, add 2 jumper wires and try to speak directly
to GSM module.

Or here is part of code that try periodically to initialize GSM:

// GSM modem check
if (_counter == 15) {
// look if GSM is free
if (nilSemWaitTimeout(&GSMSem, TIME_IMMEDIATE) != NIL_MSG_TMO) {
GSMisAlive = GSM.ATsendCmd(AT_is_alive);
if (GSMisAlive == 1) {
if (!GSMsetSMS) {
//GSMsetSMS = GSM.ATsendCmd(AT_CLIP_ON); // CLI On
GSMsetSMS = GSM.ATsendCmd(AT_set_sms_to_text); // set modem to text SMS
format
if (GSMsetSMS) GSMsetSMS = GSM.ATsendCmd(AT_set_sms_receive); // Set modem
to dump SMS to serial
GSM.ATsendCmdWR(AT_modem_info, (uint8_t*)modem_info);
}
_resp = GSM.ATsendCmdWR(AT_registered, _text, 3);
GSMreg = strtol((char*)_text, NULL, 10);
_resp = GSM.ATsendCmdWR(AT_signal_strength, _text, 2);
GSMstrength = (strtol((char*)_text, NULL, 10)) * 3;
} else { GSMreg = 4; GSMstrength = 0; GSMsetSMS = 0;}
nilSemSignal(&GSMSem); // Exit region.
if (_GSMlastStatus != GSMreg) { // if modem registration changes log it
_GSMlastStatus = GSMreg;
_tmp[0] = 'M'; _tmp[1] = GSMreg; _tmp[2] = GSMstrength; pushToLog(_tmp, 3);
}
}
}


I can maybe compile special firmware to put more text to Debug tab.

Or you can also verify by ohmmeter the antenna wire. When GW is turned off.
One tip to GSM module pad and second tip to end of pigtail. The
connector(s) may be loose, I've seen it before.

Adam

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Re: OHS-SMS

Jonathan
Hi Adam
  Did you get the photos of the UFL socket orientation..?
Kr
Jonathan
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Re: OHS-SMS

vysocan
Administrator
Hello Jonathan,

yes, :( sorry it really looks like I put wrong way. The pin is connected only to the leg that comes from under the U.FL connector.

Do you have equipment to fix it? Hot air gun is best.

Adam
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Re: OHS-SMS

Jonathan
Its going, got the UFL connector off OK, but removing the surplus solder off it caused the ring to break away. Just made an antennae of copper wire, soldered that onto pin 32 and its sending me texts :-)
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Re: OHS-SMS

Jonathan
SMS begin: 1
SMS sent: -21
Page begin: -11
Email -GSM len: 8>+CMGS: 2<
-GSM len: 0><
-GSM len: 2>OK<
OK
Email End
Alert end
>Radio A:20,Data 25,53-54-0-11-C7-97-41-56-0-99-E9-77-40-58-0-0-0-16-42-44-0-0-0-0-0-RSSI:-27
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Re: OHS-SMS

vysocan
Administrator
This post was updated on .
In reply to this post by Jonathan
That is awesome, really. Sorry again for the problem.

I'll put here the image, since it is just nice work.
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Re: OHS-SMS

alinkamaja
In reply to this post by Jonathan
A few things to check when a giffgaff SIM won’t send SMS on one modem but works on another:
• Network mode/bands: set the gateway to 3G/UMTS (not LTE-only), and make sure it supports 900/2100 MHz (O2/giffgaff).  
• SIM PIN/lock: disable SIM PIN and verify the device isn’t carrier-locked.  
• Signal/registration: check RSSI and registration (AT+CSQ, AT+CREG?, AT+COPS?). If not registered, try manual select to O2 UK.  
• SMS settings: many gateways need TEXT mode (AT+CMGF=1). Read/set the SMSC (AT+CSCA? / AT+CSCA="number")—copy the service-centre number from the working modem.  
• Storage: ensure SMS memory isn’t full (AT+CPMS?).  
• APN/profile: some devices won’t fully attach without a correct profile—use giffgaff APN (typically “giffgaff.com”, user “giffgaff”, pass “password”).  
• Credit/account: confirm the line has credit/active bundle; giffgaff can block SMS if the package lapsed.  
• Firmware/driver: update the gateway firmware; some builds break SMS on certain modules.  
• Swap test: try another known-good SIM in the problem gateway and your giffgaff SIM in a third device to isolate hardware vs. config.

If you can share the module model and the AT log when you run: AT+CFUN?; AT+CSQ; AT+CREG?; AT+COPS?; AT+CMGF?; AT+CSCA?; and the error from AT+CMGS, I can suggest exact commands to fix it.

Tra l’altro, se stai preparando un look per la sera, puoi dare un tocco moderno con gli abiti asimmetrici, linee dinamiche che slanciano e funzionano bene sia con tacchi sia con sandali.