iPhone SE Activation Server Error

Hi! I'm currently trying to activate my iPhone SE, but nothing seems to be working. For a while, it was stuck on a "connect to iTunes" screen. From there, I had to update and restore the phone by connecting it to iTunes, prompting the "Hello" register sequence. The phone's home button seems to be broken (it wasn't broken prior to any of this), so I had to turn on and off the phone in order to skip the "Press home to open". When I did, I was able to go all the way to the final activation screen ("It may take a few minutes to activate your iPhone.), but after a bit of time, it simply says that there is an error, both on iTunes on my MacBook and on the iPhone itself. I've tried to change the WiFi network and the SIM Cards, but nothing is working.

I'm studying abroad soon, and I really need to fix this phone by then, so any help would be greatly appreciated! Thanks so much in advance.