I found this article from TechRadar.com. Thought it might be useful to iPhone owners in Malaysia. I don't even use it myself. Enjoy

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How to boost your iPhone's signal using tape

The Apple iPhone does many things well, but it also has its flaws. One of the biggest among some examples is an uncanny ability to drop calls or lose a signal without warning. Now someone has come up with a canny solution.

Jeggrey Swiger has discovered that attaching a small piece of 'Scotch tape' (that's sticky tape to us non-Americans) to the SIM card results in a massive signal boost. Why?

Because attaching the tape to the side of the SIM card that doesn't have the metal contacts on seems to hold the SIM card more firmly in place, so boosting the signal. Or so iPhone Atlas reports [via Wired].

Other possible solutions include re-reseating the SIM, resetting the iPhone, charging the battery (duh!) or restoring the iPhone to its factory settings. More outlandish though is the suggestion, also from iPhone Atlas, that:

"Some readers have found that simply attaching a dangling (not connected to anything) USB cable to the iPhone provides an instant boost in signal strength."

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Sick, sick, sick

So let's get this straight. You've laid out a fortune on a super-stylish, super-smart iPhone now and you're going to dangle a USB cable from it so you can get a decent signal. Isn't that a bit like watching a tapeworm work its way out of a supermodel's bottom?

We have a better solution: if your iPhone keeps playing up, take it back to the shop you bought it from and get a repair or replacement. The iPhone is covered by one year's Apple warranty as standard and O2 or whoever should help you sort out the problem.

You're within your rights as someone who's paid £269 for the phone and are paying £35 per month plus for a contract to have the issue resolved.

Unless, of course, you've been silly enough to invalidate the warranty by a) resorting to sticky tape; or b) hacking the thing to run third-party apps. In which a dangling cable is possibly the best you can hope for.

By Rob Mead