Unlocking Emobile- new contract

ROB42

hi guys

my father has his own business which includes a number of phones, there on bill pay with emobile. hes been on this contract 2+ years paying 35+ per phone. most of which is probably irrelevant. he gets yearly upgrades, its due now, we are thinking of getting a iPhone 5s/6 and i using it myself (on Vodafone)

now i have read on the website that you can unlock the phone if you've paid so much and been with them so long, all of with we pass.

so if i (my father) ask them to unlock the phone (just after resigning a contract) how will they react?

thanks in advance

Rob