Week 4, besides listed iPhone sales of crazy speed, consumers, and it is the most media attention in the hand-held attenuation. An excellent design of mobile phone, so even users to change the way to hold the normal use, this really embarrassing.

Firstly, a hand-held condition attenuation problem is not original, a lot of mobile phones April iPhone will have such a situation. But in recent years, most of the mobile phone has been on the phone will antenna hidden inside the top or bottom, users in the ordinary way down to the hold to, also affect the little attention.
Therefore, the apple “innovation” external antenna design. Besides body frame, the stainless steel frame around 4 iPhone also played a role, and antenna into two phases. For bluetooth, for the left hemisphere, GPS antennas, WiFi section for 3G mobile network 2G/antenna. The black “mobile” two antenna aperture of the boundary. Problem is, when carrying out here, especially the iPhone at hand, people experience as conductors, two antenna conduction, thus forming a mobile phone signal interference effect.

In early April, will give by many communications industry insiders premonition came to this problem. Everyone was expected in stainless steel frame, apple on coated insulating material, can avoid this problem. But unfortunately, apple has not done so. Now, the products have been listed, the answer is given an apple or change, or buy with that can act as a layer of the role of mobile phone.

In Anandtech website to give the evaluation of 4 to this problem, the detailed test. We know, almost all of the mobile phones are used in the form of cylindrical signal intensity, is that we often say “a few case signal”. But due to the definition of each signal measurement method, so the ways to solve the problem really is meaningless. Hence, testers can take iPhone 4 and show the signal strength 3.1.3 version 1.0.4 3GS iPhone, under the same signal environment, and finally gives repeatedly testing the iPhone 4 signal columnar behind the accurate meaning.
As you can see, from UMTS 3G network signals to limit 51dBm – 91dBm – 4, iPhone will display for five lattice signal. And then there would be little space, 91dBm – to – 101dBm for four, 101dBm – - 103dBm for three, 103dBm – to – 107dBM for two, 107dBM – - 113dBm for a case. If the signal is below – 113dBm, call and data connection will be interrupted.

According to the test, and four causes signal clenched iPhone 24dB dropped most. The question is, the same 24dB dropped in user experience will appear on two distinct effect:
When you are in 3G base, signal in the near 67dBm – good 51dBm – even 24dB drop between, also still in 91dBm – mobile phone still showed for the above five lattice signals, and the Internet, it is almost impossible to be affected.
But if you 89dBm – this signal is that, although also five case filled with signals, but if 24dB decreased after will immediately below the bottom line, 113dBm – bolt phenomenon. Itself is already four signal is not to mention. Due to the phone display signals are 10 seconds delay, you will see on screen from five lattice drop signal again until it is lost.