On an iPad or iPod Touch follow the same steps to get to the Messages tab of the Settings app. Scroll down and tap Send & Receive. There, you can choose to receive iMessages sent to your iPhone number. On your Mac, you can enable the feature by opening the Messages app, clicking Messages at the top left of your screen and selecting Preferences. From there click the Accounts tab and under iMessage you'll see your phone number. Make sure it's checked.
Keep advertisers from tracking what you do
Apple has added a new privacy setting in iOS 6 that enables users to block advertisers from tapping into your usage data and Web browser cookies, or a text file that resides on your device and contains information about websites you visit. Advertisers can use the data and the cookies to target specific ads to the user.