I've had phone service with ATT&T for many many years with the same phone line and phone number. I also have internet service and cellular service as well with ATT&T... As long as i've had their service i've had the inside wire maint fee which is $7.50 /month... so with that insurance if that is what ATT&T calls it i've never ever had phone problems. I ordered another add'l phone line and paid the installation fee which is understandable...but i didn't purchase the inside wire maint insurance...so strangely because i don't have this maint fee they will come and troubleshoot this new add'l phone line for a charge of 85.00 on up per hour. Strange is it not that the phone line that has the insurance never has problems...but the phone line that doens't have the insurance cuts off on a monday morning just like that...To make this long story short...ATT&T purposely does this to you...they check on who has the insurance in your database and has your line purposely not work just so that they can make their money!!! so if anyone notices that you have two separate phones...one with insurance and one without...promise you att&t will tamper with the phone line without the insurance and will charge you...ATT&T is a rip off...