Hello, I hope these logo ideas are close to what you are going for. I wanted to keep it as simple and to the point as possible. Not only because it might be seen very small in an app icon, but I think it reflects your app and it's functionality, get to the point fast and be effective about it. I think it shows the broadcasting or "shouting" for help in a high tech manner. Let me know if you like the concept and want any color adjustments or tweaks. Thanks for your consideration.
#9 is best. I'd like to see how it looks as a black background mobile app icon like #35. White SOS. I do like the square "O", but would maybe add a speaker dash at the top of the "O" to clarify the idea it's a cell phone. Thanks.