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  1. #1
    Join Date
    Mar 2017

    Arduino gps / gsm / gprs sim problem

    Hello, I am just looking for some advice, I recently purchased: SIM808 GPS/GPRS/GSM Arduino Shield(Product Code : RB-Dfr-665) {}, but I have not been able to collect any GPS data? I am getting the "Open the GPS power success" in the serial terminal when I connect to an external power source, but nothing else is happening. In the AT commands it is coming up with AT+CPIN? which I can see means an error with the SIM card. (Just wondering if this is something to do with APN settings?)

    Another query I am wondering about..I have purchased a GiffGaff SIM card that says it is 2G/3G/4G compatible. Should this be okay for the device? Also I am in the UK.

    Any advice would be great for a newbie.


  2. #2
    2kaud's Avatar
    2kaud is offline Super Moderator Power Poster
    Join Date
    Dec 2012

    Re: Arduino gps / gsm / gprs sim problem

    Have you tried asking on the Arduino forum at
    All advice is offered in good faith only. All my code is tested (unless stated explicitly otherwise) with the latest version of Microsoft Visual Studio (using the supported features of the latest standard) and is offered as examples only - not as production quality. I cannot offer advice regarding any other c/c++ compiler/IDE or incompatibilities with VS. You are ultimately responsible for the effects of your programs and the integrity of the machines they run on. Anything I post, code snippets, advice, etc is licensed as Public Domain and can be used without reference or acknowledgement. Also note that I only provide advice and guidance via the forums - and not via private messages!

    C++23 Compiler: Microsoft VS2022 (17.2.2)

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