Hello. I have recently bought a SIM800L V2 GSM module to use with my Arduino Uno R3.
Knowingly that the SIM800L V1 did not support 5v supplied to it, I bought it's second version explicitly so I can power it from my Arduino board like I've seen in couple tutorials on youtube, yet my module never connects to network. The issue is pretty complex.
Whenever I power the module with the sim card in it, the network connection LED blinks every 1 second to which the power LED stays on for 8 seconds and afterwards the whole module restarts. Although when I boot the module without the sim card in it, this issue does not seem to happen at all, the module is not restarting anymore. When I try to insert the sim card after, it still does not connect to the network. I have tried using an external power of 5v and 2.1a to power the module, tried shorter jumper wires. Is it possible that the module might be broken? Let me know. The network provider does have 2G coverage
PS: I added a 2000uF capacitor rated for 10v between the VCC pin and GND of the SIM800L V2.
You're not wrong there, and it's none too coherent either. You don't quote the YouTube item, but I understood that powering the GSM off an Arduino was a bad idea.
Well, I tried my best to explain the situation with my own words. I'm kind of kneeled down in front of this situation, because, neither is english my main language, neither do I have experience in this domain. I'm just a beginner looking for answers from someone with experience. 
OK then, for what it's worth, I only suggest that, since
a. you are not forthcoming about the YouTube item, or your actual installation, and
b. you actually have a 5v 2A power supply on hand
you stick with using that separate supply, and pursue the matter from there. I mention that because I recall that most of the grief with SIM shields was about the power supply, and I would be suss about one with a low power demand,as you imply.
I've fixed the issue by adding a 2000uF capacitor rated for 10v between the VCC pin and GND of the SIM800L V2 module. Thanks for the help regardless.
Hi friend. did you still used a 5v supply?
Yes, a 5V supply with 2A output, and an additional 2000 or 2200uF capacitor for 10V between the VCC pin and GND of the module. You can either solder it to the module itself or use a breadboard.
Thanks bro. I'll consider this when implementing my project.
Make sure to have a right output for the module, and if this issue does occur, like it happened to me, just use one of those capacitors. Usually this happens because the module does not have a stable enough powering source (I assumed), so adding a capacitor could maintain the circuit's flow of current. On the other hand you can also get a SIM800C Quad which can be powered separately throughout it's battery pins from a 3.7V 2A accumulator, LIPO or LI ION battery from what I've seen on the internet. Either way good luck!
Noted. what's the nature of your project?
A simple remote weather station, which sends the collected data from the temperature/pressure/humidity sensors thru SMS.
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