Chosen Solution

I have 2 iPhone 5ss. One is unlocked with AT&T and another is in iCloud lock with Verizon. But I wanted to switch carriers and have an unlocked Verizon IPhone 5s. Is there a way to switch carriers in the motherboard somehow?

No, the carrier lock is set in the Apple servers and downloaded to the phone during activation. It is encrypted so you can’t change it.