If you're one of the legions of Pokemon GO trainers who have been relying on cheats or third-party software to make your collecting more efficient, I have some bad news. Niantic is on to you, and they want you to stop.
In a note posted on the official Pokemon GO site, the developers have warned that anyone who uses emulators, modded software, or a variety of means to spoof their GPS location will be hit by the banhammer. A permanent one.
Your account was permanently terminated for violations of the Pokemon GO Terms of Service. This includes, but is not limited to: falsifying your location, using emulators, modified or unofficial software and/or accessing Pokemon GO clients or backends in an unauthorised manner including through the use of third party software.
There's always an opportunity to appeal the ban by submitting a support ticket. Given how swamped Niantic is with fixing and updating the game, however, I can't imagine they would respond to those with any expediency.
So consider this a word of warning: maybe don't GPS spoof. You don't want to have to grind 400 Magikarp candies from scratch, now do you?