Why do I need money to develop information with my friend's Apple phone?

Open on both sides! I don't know the details. You can find tutorials online!

Make sure your iPhone system is iOS5, otherwise please update the system yourself.

Run message: iMessage is not a separate program. Instead, Apple integrated iMessages with SMS and called it "information".

Use imessage:iphone (with ios5 system installed) will automatically detect the number you want to send and check whether it is an iphone running ios5. If it detects an ios5 device, it will automatically send an iMessage message instead of a short message.

This has crossed the operators, and it is free, even in the United States and China, texting is free.

Address book update: Once you confirm that your contact is using ios5 system, your address book will update his information, and a small blue bubble will appear behind the contact name, indicating that these contacts can receive iMessages.

How to decide: If you are still not sure whether you are sending an iMessage message or a short message, Apple changed the color of the short message chat window. The SMS chat window is a green bubble, while the chat bubble in the iMessgae window is blue.