Inexoensive emergency phone

dr18

I'm currently using a cdma flip phone on a Verizon MVNO. Reception is getting poor (repurposed towers). I gather a need a phone which has Verizon VOLTE support. I see the basic volte phones are $120+.  I don't really want a smartphone, due to battery life, but are there any compatible inexpensive smartphones?

For a MVNO, I can use any Verison post-paid phone, but not Prepaid phone?

Thanks

dr18

Inexpensive :-)  There was a typo.