no Direct TV DVR without phone line?

I own a Hughes hd 10/250 Direct TV reciever with the DVR feature.

Recently I cancelled my (land) phone line to use my cell phone for all calls and have been getting error messages on my Direct TV service saying that I need the phone hookup to continue the DVR service.

Is there any way around this?

Will my DVR service stop working?

I called Direct TV and the girl in service had no idea what to tell me...

any info appreciated

Phil