Unhappy [Q] Problem in S4 Signal

Hello guys
Hope that all of you are Fine
I'm new in Android field
I have a Samsung Galaxy S4 Mini With Fido ( a Canadian Mobile Company )
I tried to unlocked in one cellphone store and he couldn't do anything ... just rooted my phone and put a modified Rom on my phone
then I went to site ( Sam mobile ) I choose my phone and my Carrier then I installed by using ( Odin )
and everything worked perfectly but I figured out that the phone could receive any signal from the network
So guy did I do something wrong ?
Thanks