The 2G cell service that the 2011-2014 Leafs use was phased out and is now gone virtually everywhere. There is a 3G modem upgrade available from Nissan for $199, but results have been very mixed so far. Some people have no problems after the upgrade, others find things worse - no connection and a regularly dying 12 volt battery. Others have had to leave the car multiple times at the dealership before the problems were resolved.
Scarlet Ember 2018 Leaf SL W/ Pro Pilot
2009 Vectrix VX-1 W/18 Leaf modules, & 3 EZIP E-bicycles.
PLEASE don't PM me with Leaf questions. Just post in the topic that seems most appropriate.