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You can send an unlimited amount of messages, photos, videos and files of any type (.doc, .zip, .pdf, etc.).
Telegram groups have up to 200 people, and you can send broadcasts to up to 100 contacts at a time.
Most of these apps can work in all of your devices like your smartphone and tablet.
Nimbuzz lets you connect Facebook and Google Talk friends with one common login.
Download Skype: Windows | MAC | Linux | i OS | Android | Windows Phone | Nokia | Amazon Fire Skype app can use to call, message and share whatever you want for free.
Secret Chats use end-to-end encryption to ensure that its intended recipient can only read a message.
Download Nimbuzz: Windows | MAC | i OS | Android | Windows Phone | Nokia | Amazon Fire Nimbuzz is a free call and messaging app for the connected generation in multiplatform.
These apps can talk each other regardless of the smartphone operating system.