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This is my GSM Module:

enter image description here

Is anyone familiar on how to connect this to my Raspberry Pi 3? Is still all I need or I have something missing?

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    It would help us to have a link to more information on that particular module and a description of what you want the Pi to do with it. – Bob Brown Feb 10 '20 at 19:31
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    Ah, let me see. The following Arduino connection might help: WARNING: No guarantee no nothing won't meltdown or blow up!: (1) imgur.com/gallery/k1kNe0v. Or you might like to read the following: (2) Sim800 Hardware Design img.filipeflop.com/files/download/Datasheet_SIM800L.pdf (3) Sim800 AT Command Set cdn-shop.adafruit.com/datasheets/… (4) SimCom Sim800/900 GSM/GPRS Modules espruino.com/SIM900. Happy connecting. Cheers. – tlfong01 Feb 11 '20 at 1:55
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    @BobBrown I'm having a difficult time trying to find one. Even finding that image took me some time. I'll get back to you on that. But in terms of what I want to do, I just basically want to be able to send an sms message. – olivakyle Feb 11 '20 at 2:36
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    @tlfong01 still no luck :( – olivakyle Feb 11 '20 at 2:59
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    @olivakyle, what do you mean by "no luck"?. No match found? Actually you don't need to look up the AliExpress catalog to find one matching your photo. If your photo does match the real thing in hand, then there is no need to look further. Look at the marking near the two pin yellow jumper. It says "SM800C". This means your module belongs to the SIM800 series. In other words, you module is in general (wiring, AT commands etc) compatible to almost all SIM800/900 cards WARNING: No Guarantee no nothing won't melt down or blow up! Take my suggestion at your own risk! – tlfong01 Feb 11 '20 at 3:26
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This looks like the SIM800 GSM chip. This needs to be connected to the serial port (UART) on the Raspberry Pi (make sure that the voltage levels on the SIM 800 and RPi pins are the same or you'll end up bricking either or both the devices).

Once that is done, you will have to use the "AT Commands" to write a program that communicates with the SIM800 over serial. Here's an AT command reference manual - https://www.elecrow.com/wiki/images/2/20/SIM800_Series_AT_Command_Manual_V1.09.pdf

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    By any chance do you know what voltage level this one requires? I'm having trouble to find a document for this chip. – olivakyle Feb 11 '20 at 17:03
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    Per the hardware design guide (simcom.ee/documents/SIM800/SIM800_Hardware%20Design_V1.09.pdf) the digital pins are rated for 3V on page 53. There's a your module already has a voltage converter installed between the header and the module pins, if not follow the recommendations on page 30-31 for appropriate voltage levels. – ankitm Feb 11 '20 at 19:09
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    upon checking I see this is a SIM800C. Is this still applicable? – olivakyle Feb 12 '20 at 11:21
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Have you considered a GSM HAT? It will be faster, easier and less damage risk to your pi. The final product will also be neatly stacked.

enter image description here

If your rPi has internet access, then you could try an internet SMS gateway (Twilio etc.) and skip the GSM radio

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