My iPhone won't connect to sync

When I plug my iPhone into the laptop, iTunes opens but my phone doesn't show on the side so i can't sync. What should I do?

To connect iPhone with Sync, you need to take care following things:
1. An iPhone, iPod touch running iOS 5 or higher
2.iTunes 10.6 or higher
3.To have your iPhone and Laptop on the same Wi-Fi network

reply me as soon as possible if it is useful for you