Not true, don't worry :)

ja27 · on July 11, 2016

Not true at all. I've wiped the app from multiple devices and accounts today and it's always restored the player's progress after you log back in.

rickyc091 · on July 11, 2016

This was the case on an android phone using Google login. His nexus 6X was on a beta build so he was unable to install the app. He started playing the game on an older device while he downgraded his 6X. After it was complete, he logged into his 6X using his google credentials and it prompted him to start over.

ja27 · on July 11, 2016

Probably because he was previously playing the Pokemon Go field test. All of the field test data was wiped, accounts and all. Everyone started over.

jeeva · on July 12, 2016

I've gone between three phones this week for various reasons, and this has not been an issue.