I don't know how long cell service was down. I just noticed went to lunch and noticed it come up just after sitting at a table.
There was an older lady near me. She either understood technology or didn't. Her phone missed a bunch of messages, email, text or call, I don't know. But when the network was going again her phone was notifying here in a very loud manner, over and over and over again for a couple minutes. She didn't know how to silence it, but knows how to communicate with it.