unlocked my Samsung discover SGH-S730M smart phone online for $8.99

found a retired XP computer, there is no personal information on it, connected it to internet,
went to www.onlineunlocks.com/s730m-unlock
chatted with their online chatting agent, make sure they are online now,
paid by Paypal to be protected by Paypal if anything goes wrong.
go to my email, got instructions from them, what I needed to do:
install two software and configure accordingly.
make some changes to my cell phone, insert unsupported SIM, connect cell phone to PC via USB.
told them the order number and user ID/password generated by the installed software,
they took control of my PC remotely, after about 10 minutes, they told me a code,
I entered the code to cell phone(it is asking for network unlock code), phone displayed: unlock successful,
I made a call and received a call, all work, then told them all work, they disconnected and done.

my simple solution to "Can't establish a reliable data connection to the server" when add account to Android

My android version: 4.0.4

I can not add account either in Play Store or in Youtube app as searched online, or in Settings-->Accounts & Sync.

tried in browser I can browse websites, also I can login to my google account from desktop.

accidentally,I turned on "Wi-Fi direct" and it automatically turned off WiFi, then I turned off "Wi-Fi direct",

turn on WiFi again, try to add account in Settings-->Accounts & Sync, it works! then I tried in Play Store, it also works.

so essentially it probably just to reset your WiFi connection.

so if you have this issue, try this simple solution first instead reset your phone to factory default or root your phone.