It’s taken 4 months but I finally broke down and purchased a cell phone.  It was just getting too hard to make arrangements with locals to not have one.  I got a great deal on a phone from someone who was selling theirs before going home but recharging the balance was an interesting challenge.  Luckily I prevailed and I now officially have a working Mexican phone number.   If you want/need it for any reason, let me know.