Fido

Can Fido change my phone which I got it 3days ago.I bought moto x for $0 n I decided to change to iPhone 4s which is also $0. Can that happen.          

Can Fido change my phone which I got it 3days ago.I bought moto x for $0 n I decided to change to iPhone 4s which is also $0. Can that happen.     ***Edited to add labels***