Is it possible to install a T-Mobile rom on the Verizon S4? topic

I would like to install a T-Mobile Rom or at least the flash the modem files on a Verizon S4. I switched it to T-Mobile prepaid and I feel it would have better service if I did that. Is this possible? I tried flashing basebands and a rom (i don't remember which one) and it didn't work.