It would be irrelevant for the 211 since hooking a phone line to it won't save you any money. Physical secondary boxes have an additional outlet fee, whereas dual-tuner receivers can have the fee associated with their second output waived for connecting to phone line.
However, if you had a 722 that wasn't connected to a phone but had a 211 connected to phone, then you could save the charge for the 722's second TV output. In theory, anyway, as I believe the 211 doesn't have DishComm active yet either.