Communications
Talking is not the only way you can use the iPhone to communicate with the world. These apps will help you stay connected and let others connect with you easily without being obtrusive.
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Twitter
The original app that defined the word "tweet" in the lexicons of the world's languages, Twitter enabled activists to topple dictators and form new governments during the Arab Spring, even when all other forms of communication had been cut off. Even if you're not looking to overthrow a government, you can still share and discover photos, news, events, and trends.
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WhatsApp Messenger for iPhone
How about an instant messaging app that doesn't require signing up or logging in? Whatsapp is the most popular smartphone IM app that lets you text and share across platforms. Using your phone number, WhatsApp lets you exchange texts, pictures, audio and video messages with your friends who are also using WhatsApp at no cost, even internationally.
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The application uses push notifications to get messages from other users without the need to log in or out. Just run the app in the background, and it will notify you when you have a new message. The best part is that it does all of this without hogging the battery.