You may have already experienced this…
Open up an iPhone application, it just freezes and hangs there. You probably try to press and hold the POWER button to turn off the iPhone, but it doesn’t respond.
This is not uncommon for you to encounter the above hang problem as you install more iPhone applications. A friend of mine, who have bought the iPhone 3G for around 2 weeks, gave me a call and asked for resolution.
So, what can you do to resolve this problem and bring your iPhone back to normal? For experienced iPhone user, you may know what to know. But for iPhone beginner, this hang may scare you.
Don’t worry. The solution is trivial and simple. What you have to do is to do a Hard Reset on the iPhone. To reset the iPhone, simply press the POWER/SLEEP button and Home button together. Hold them until you can see the boot screen, which is with black background and Apple logo. One point to note is you have to release both buttons at the same time.