SS2 connection to a 4g network extender

My house is in a very poor signal area so I had a 3g network extender from Verizon.  They dropped support on that extender and upgraded me to a 4g extender.  So I had Simplisafe send me a 4g network card for my SS2 base station.  Simple, right?  Not so much.  After spending a half a day talking to Simplisafe and then Verizon, we gave up trying to make it work.  I put the 3g card back in the base station and it worked if I put it in the perfect spot in my house where it could pick up signal from the closest tower.  Now I see that as of January 1, 2020 I have no connection to dispatch.  I suspect Verizon may have turned off 3g signal on the tower I was communicating with.  I put the 4g card back in my base station, and I have no blinking red light, but I still have no link to dispatch.  So my question to the forum is : Does anybody have a SS2 base station with a Verizon 4g cellular card working with a Verizon 4g network extender?  It works great with cell phones, so I think it should work with the base station.  I also have considered that maybe I just have a defective 4g card in my base station.  Any suggestions would be better than what I have now, which is nothing!