switching phones but service is verizon with cmda

i have an iphone 6 and the screen is messed up, it is cracked and the pixels are turning weird colors, it is extremely hard to use. in the mean time i would like to switch my sim card to a different phone so i do not have to pay for new service or to buy a new phone, the issue is that i have verizon so my phone is cmda meaning that i cannot simply switch the sim to any phone, i do not have applecare but i am due for a free upgrade in mid octoper. but since it's june i need a working phone until then