"....Can ya hear me now?..."
Sorry I just couldn't resist!!!
I feel your pain. I have seen times when a noise like a cell phone going off wouldn't bother a tom. They don't make calls so they don't know what it is. A lot depends on the circumstances surrounding the noise. Shoot, some of the noises I have made in the name of calling is probably worse than a cell phone going off. Keep your chin up and keep trying, at this point what do you have to loose?