If i buy a verizon iphone from ebay can i change it to tmobile?

I'm trying to buy an iphone 4s but i have a low budget and i found a phone on eebay within my price but it's a verizon phone and i use tmobile, so would i be able to switch it?

No…

Even though CDMA iphones on Verizon/Sprint/Vigin Mobile/MetroPCS/Cricket are Global Ready and have SIM card slots for use with GSM carriers overseas, Apple--inconjunction with the CDAM carriers, have locked all US GSM carrier sims on their CDMA Iphones and Androids, which prevents SIM Swapping on Global Ready phones… You can thank the owners of the old 2008 Blackberry Tour and BB Storm 1 and 2 for that policy… Lmao

Only a unlocked ATT or unlock Straight Talk Iphone will work on Tmobile…

any complaints can be sent to Apple and, in your case, Verizon…