How to tell if an iPhone is a victim of jailbreak

So  a neighbor said he had an extra iPhone 5 his company did not want back and that my daughter could have it.  It has some software on it that makes it unusable if stolen or found.  He started looking into jailbreak to get it off.  From what I read about this I don't want any part of a phone that has basically been hacked.  He now says a guy from the company's IT is taking the software off for him.  When I get the phone, is there a way I can tell if the IOS has been tampered with in this way?  I don't want to give my daughter something that could cause her grief down the road.
I know from other posts I have see that we are not supposed to discuss things like jailbreak here, but I am looking for a way to determine if this has been used on a phone.
Thanks

Look in the app store - there are many apps that do anti theft tracking. Many can be defeated by factory resetting the device - it is simply the nature of how Apple restrict developers from locking an app to a device. A factory reset can be done in iTunes 'restore device' or via Settings > Reset, 'erase content & settings' in iOS.
If the company used iCloud for anti theft tracking you can't avoid it being reassociated with iCloud after a factory reset.
I also believe OS X server has similar features for anti theft tracking for corporate customers. So the device may be tied to an OS X server within the company, it;s unclear if the device will become reassociated, it depends on the company setup IIRC.
The simplest answer is to get the company IT to remove whatever they used. If you want to be certain there is no other jailbreaks on the device just factory reset it. That will also remove any data left over from a previous owner.

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