@Newtos8p: As your phone was intended to be used in the United Arab Emirates, the software on the device will be representative of that region. US dollars are widely accepted across Dubai, so this is likely to be why the Play Store defaults to that currency. Did you set up the phone while you were in Dubai? If so, you may wish to return the device to it's default factory settings, and complete the setup process once again, including the registration of your Google account, to see if this helps. For further guidance, please refer to the steps in the link below.
