acerola-orion can you please explain one of the simpler methods you mentioned? I'm currently out of ideas since the game is now device locked. I'd really appreciate any help I could get regarding this 15 referrals.
Using BlueStacks is likely the easiest method. It doesn't even require you to do anything to your device. It's perfectly legal as well. And unlike the case of uninstalling and reinstalling the app on your phone, uninstalling and reinstalling BlueStacks -should- work. I haven't tried it though, since I was too lazy to do so and I ended up getting my referrals anyway, so I only gave myself one referral with it.
I've not tried this but i hear you can root bluestacks after that not sure how to get it to see it as a new device....but easiest way for me to get invites is Best Buy's or any cell phone store with demo's =D