If i change an iphone 5s from t-mobile to metro will it be faster or not?

A week a go i got an iphone 5s from t -mobile because i thought it would be fast but its not so somebody told me its not going to be fast if i change it to metro.

You can't use that phone on MetroPCS. Metro is a CDMA carrier. T-Mobile is not. How are you judging how "fast' the phone is, anyway?

Why cnt i?!

IPhone 5s phones are GSM not CDMA. All Metro phones manufactured after the merger are GSM (galaxy s3s are cdma galaxy s4s are now gsm.) The service will be the same or a little worse as they both use T-Mobile towers and I would assume they give priority to the T-Mobile customers.