It wasn’t long ago on a Southwest flight that I went forward and observed a flight attendant sitting in her jump seat and talking on her cell inflight. Cell phones ‘off’ rules are only for us apparently.
Are you sure it was her cell phone?
Southwest used to have "air phones". I don't know if they still do -- a lot of airlines have dropped them because they weren't getting enough revenue to justify the weight of the equipment (and the gas to fly it around).
Some of the air phone systems had a "crew phone" -- a cordless phone that was reserved for the crew for company business.