I'm really frustrated because Samsung won't allow a software update using mobile data. I haven't updated my phone's software because I do not have wifi, which is required for software updates. If it's like this it's probably much better to switch to a phone that allows software updates with mobile data.
If you download a software update over cellular data and your signal strength changes, it could botch the software update. Then when you're phone restarts it could get stuck on a boot loop. Then you'd be without a phone. Simply go to the library or a McDonald's parking lot like someone else suggested.