Panasonic cordless phone I cannot use it in backyard.?

[meranda_20002000]

Okay we reasonly have moved and I have my cordless phones that I was able to use in the other house with no problems,I was able to use it in the back yard and front.Since we moved I cannot use it in the back yard.it only reachs out my back door and thats it.when I try to make a phone call it saids system busy please try agaun later.well no one is on the other phone.My main base is in my bedroom with the router connected to it I have WOW service.I don't know whats going on when I was able to use it in the other house.
well i'm pretty much stuck in 1990 cause I don't have a cell phone,lol