If you are like me and run a stock standard Apple iPhone 3G and by that I mean an Apple iPhone that is not Jailbroken, then you may have noticed sometimes the phone can be slow.
Usually after a reboot the phone will be pretty snappy, but we all know how long it takes any kind of smart phone to reboot, although the I find the Apple iPhone relatively quick when compared, but overall a bit slow.
Here are some useful things to know about the Apple iPhone OS.
In general when you run an app and then close it it has been removed from memory, however I learnt this great trick.
If you are in any app and you hold the power button down until the screen darkens on your Apple iPhone and you are prompted to either shut down or cancel. At this point the only button you need to push and keep pushed is your “home’ button. You will notice after about 3 seconds the iPhone freezes and then the app that was running is ejected from memory.
When next you are finding your Apple iPhone 3G is not performing as you know it should open Safari and perform this trick. (It is always a good idea to clear web pages you are no longer using in Safari)
As far as I know these are the only memory resident programs that run simultaneously with the OS. Along with the “phone’ app.
You can do this with your mail application and with iPod app. After this you will find your iPhone should perform much quicker.
Hope this helps
If you have a favourite website you frequent with your Apple iPhone, then simply touch the “+” icon when you are on your favourite website.

and then touch the “Add to Home Screen” button.

If the website has an icon it will reflect otherwise a screenshot is taken.

When you are done the icon will now show on your Home Screen.

This is especially useful for some iPhone ‘apps’ that run online like Google Talk.
If you are typing a message on your Apple iPhone, and have made a mistake, simply shake your phone and you will be prompted if you would like to undo your last typed action.

I actually never knew this one and found it out accidentally as one does with so many things on the Apple iPhone.
This is a simple yet useful tip.

When you are writing a note or message with the virtual keyboard on your Apple iPhone and need to access theĀ “punctuation keypad”, simply press the “.?123″ on the keyboard and without lifting your finger select the symbol you want, then lift your finger.

The symbol you select is inserted into your note or message and the keypad automatically returns to it’s normal mode.
Credit to mitchmagi.
Since I have been so busy lately and have been using my Apple iPhone a lot recently, there are a couple of great tips and tricks that I come across online. I thought it would make sense to create a collection of the most valuable and useful of tips for fellow Apple iPhone users.
I look forward to bringing you iPhone tips and tricks and if you would to contribute please feel free to make contact.