My name is ***** ***** I will be your device technician for the day.
Its seems if the phone was jail broken it can be used on any network. So yes you will be fine because Sprint and Verizon uses the same network.
Can you please rate me on my services.
I don't think they wouldn't even care as long as the phone isn't locked. Your att sim card wouldn't work functionally because they don't share any of the same network towers. But Verzion will hook it up with no problem.