To withdraw BTC from pow88, one needs to disclose his phone number?
I have tried to withdraw something but it keeps telling me stuff about wrong phone numbers.
I never set my phone and I'm not going to, however I want what's rightfully mine.
I have trading password set. That should be enough. Need some help with this.
I needed to add my phone number and set up 2FA plus the trading password to withdraw from them. Try getting textPlus or another VOIP program if you don't want to give them your actual number, or use one of those online verification sites (it does mention POW88 in the text, but just POW88 and the code). I have tried to withdraw something but it keeps telling me stuff about wrong phone numbers.
I never set my phone and I'm not going to, however I want what's rightfully mine.
I have trading password set. That should be enough. Need some help with this.
Maybe try sending them a PM if none of those other solutions work.
Guess they don't need additional promotion through this bitcointalk channel
which is like super weird move, in my opinion. Nevertheless I should inform that I was paid by this service. There was no other way around than full phone number disclosure 
I wasn't taking any chances with some phone-proxy/fake number. Bonus bump
for the thread, one of the last real-deal cloud mining here. Last long and prosper. 
