I have a Samsung Galaxy S Duos, and ever since I bought my cell phone, I am unable to access the Google Play Store due to the error message:
Authentication is required. You need to sign in to your Google Account.
I had signed in my Google account already and have used it on my phone with other apps, like Talk, Gmail and etc. I have tried clearing the account and re-entering it, wiping out all the data and re-building a new account, and other possible solutions, but still my problem is there.
My one possible guess is that it is due to the country I live in. It may be that Google has put some sanctions on my country, Iran.
How can I get Google Play Store to work on my phone?