I've been thinking for a while about how to make a call with an mp3 file on an SD card, and save it on it so I can listen to it later.
I looked to buy an Arduino GSM module, and a module for the SD card, but I don't have the necessary skills to do the code, can you help me?
I'd like to make the arduino be able to call someone with a pre-recorded message. If someone calls it it gives another audio. If someone sends a message it answers him (I know how to do it).
welcome to the ardiuno-forum.
I'm not yet sure if I understand right what you want to do
"make a call" sounds like your arduino initiates the call-
Save it on SD-card sounds like a call comes in and what the caller is saying shall be recorded on SD-card.
Or do you mean the arduino is initiating a call to somebody. This somebody is answering the call. The arduino plays back an MP3-file and the called person says an answer which will be recorded on SD-card?
the adafruit FONA GSM-module might be suitable
But I have no personal experience with it.
In general: you can ask as many questions as you like. Some of the threads are at posting 500+ You should give an overview about the final purpose of your project. Of course you are free to decide to write about it. If you do it will make things easier.
Sure the users here can help. Help in the sense of answering questions to guide you in gaining knowledge about programming or answering specific questions like "how can I ...." or "why does my code..."
As long as you show some own effort in learning programming you will get answers to questions.