I have a customer with a PRI MICS & a call pilot 150 thats been in place for about 3-4 years. 1 user(the boss) has trouble consisently retrieving his messages from a cell phone. According to him , sometimes it will work, sometimes it won't(according to him, signal strength is also not the issue). I suspect impatience & fat fingers, or possibly problems with DTMF signals over cellular service, but I thought I'd ask around & see if anyone has had similar issues & if you had, what was the remedy.