Well, we're relieved to hear Gunner didn't actually ~ eat ~ the phone. Though we're still sorry to hear about the phone's demise.
Labs are chewers, no doubt about it. Gifford was one and most of the labs we familiar with have ventured right up to and occasionally both front paws over edge that separates the living from the recently departed. Somehow they manage not to stray too far over the line. :-)
They do settle down in a few years, usually.
Heh, yes indeed, ours can't be trusted with anything. They're bad puppies.