Just avoid holding it in that way.

I didn't face any reception problem yet, maybe I didn't call as much, well I have no idea.

Bumper acts as non electric charge material

Our body has electronic charges and it can discharge or accept radiation or micro voltage. Once our body touches RF item, our body will act as a bigger antenna.

But for higher frequencies, such as WCDMA uses 2100Mhz band, it will distort the radiation and thus cut off the frequencies.

Similar goes to WiFi signal which uses 2.4Ghz band

This is why the bumper act as a insulator between our body and the antenna

maybe yes...maybe not....but i'm glad to have it.......

That is because too many people are using the wifi at the conference hall..I don't see anything wrong with the iPhone 4..

Thanks

ah dude if you check before you type the 3GS uses a different broadcomm chip then iphone 4 for wifi, the 3GS is up to G only while the iPhone 4 is up too N,and also to be fair the iphone 3GS was having issues as well(took time to load as opposed to seamless loading speed)

It matters. N wireless network and G wireless network works at a totally different way. Not to mention different bands. But the iPhone 4 was mentioned to use the 2.4GHz only.

In my point of view..i think because most laptops etc during the keynote is using N-wireless and all this time iPhone presentation uses the G-wireless. But when apple launched the iPhone 4 with N-wireless capabilities the network got congested.

Just my 2 cents.

I didn't do any research also. But based on my experience in my shared apartment with my friends. Only my mac has the N-wireless capabilities compared to my friends. And i can see a noticeable difference in browsing speed etc.

I myself doesnt possess a iphone. If i not mistaken, now 3GS by using itunes can free update or install IOS 4, is it true? If is so but why stil got ppl offer or download fr internet for 3GS upgrade to IOS4? Or those jailbreak 3GS nid tis kind of "support"?

Is ther any1 try compare b4 => 3GS wit IOS4 COMPARE wit Iphone4 wit IOS4 performance? Same OS but diff hardware/hp~

look buddy we are not talking about congestion in a similar connection, its basically issues with overload bandwith, because there were 500++ personal mifi devices emitting either N or G wireless signals at the same time in a packed room it has nothing to do with connection speed,

This should explain the predicament better

if we buy iphone 3GS from Maxis now...do u think it will be pre-installed with iOS4 ? 

I saw your comments so I thought of giving you further insights into the problem. Actually the chip does play a major role in signal quality and reliability during calls/connection. With IC advancement and RF design, efficiency would be better. The iPhone 4's RF chip probably receive 1 full year of innovation since 3GS so it could be more sensitive to signals kinda like how a new GPS chip is better and more accurate than previous one.

Also new IC would allow new features or better control by firmware programming. As a result, handling of 2.5G/3.5G radios would be better especially the transition from one radio to the other when you move around. Also the handling of transfer from one cell to the other. It is typical for the phone to switch from 3G to 2G when 3G signal is weak and only to switch back to 3G when signal improves (due to power consumption and signal quality). With the typical antenna placement on the bottom of the phone (due to SAR requirements), this problem is amplified. Most dropped calls happen here when the phone switches radio. However, the base station also play a role in the handling of switching. And we all know AT&T's infrastructure is dodgy hehehe, so this is nothing new. This is also a limitation in the current mobile infrastructure we're using now. 

Another factor in dropped calls is when you move from one cell to another cell. The phone needs to register to the new station and service is transferred. MOst of the time this is transparent to us. Sometimes handling isn't smooth and you will get dropped calls. Anyway going back to the RF IC, there was suspicion that the IC used on 3G/3GS was flawed. So it does play a role in this issue. The antenna design serves to improve the efficiency of the whole setup and is just one part of the problem. By the way, there are reasons why antenna 'should be inside' the case. Hehehehe... There's one way to improve signal quality via antenna design. That is to adopt a 3D plane antenna. A good example is Acer's 3D WIFI plane antenna used on most of its laptop. The isotropy of radiation and its pattern is more evenly distributed. But you need more space, something iPhone doesn't have.

Before I forget, switching policies does make a difference too. For example, 3G preferred or 2G preferred or 3G only/2G only, etc. The policies are usually set in the interest of power consumption (due to near far phenomena of GSM radios) and signal quality vs signal strength. Sometimes strength doesn't mean anything when the quality is low.

These are some of my insights and 2 cents.

Hi guys, I have an N82 and I'm planning to upgrade to an iPhone 4. I would like to ask a few questions.

1) I don't usually carry cables with me, so I normally transfer files via BlueTooth to other machines/phones. Does the iPhone 4 support this?

2) I have Linux (Ubuntu). Can I transfer files (with cable) or micro-sd card to/from the iPhone 4?

3) My current phone has lots of MP3 files. Some of them I use as alarm/SMS/ringtones, any problems to use them on an iPhone?

4) I heard iPhone 4 browser is much better and faster than other phones, so no problem if I visit Flash sites right?

5) I heard the new iPhone 4 has a front camera but only WiFi by default, but are there 3rd-party applications that can use it to communicate with other phones via 3G?

Thanks for your attention!

Check this out guys

http://www.engadget.com/2010/06/23/yes-you...h-the-iphone-4/

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Ever since Apple decided to do little about the iPhone 4's pronounced reception issues except suggest that users hold the thing differently and / or buy a nice case, the voodoo engineering remedies have been flying in full force -- sure, we'll admit we tried sticking some tape over the side of our phone (no dice), but we stopped short when people suggested we try a couple coats of nail polish (insanity). Even we have limits, after all. But the latest snake oil fix is definitely the craziest we've heard so far: according to a 13-page (and growing) thread at MacRumors, the iPhone 4's reception issue can be fixed by adjusting or even trimming the micro SIM so the contacts don't touch the metal tray. The popular belief is that touching the side of the phone somehow shorts across the micro SIM, causing (mumble mumble) and leading to dropped signal. Making things more interesting, Apple and AT&T are apparently using several different types of micro SIMs, including one with a significantly larger contact area -- you can check a shot of two of our iPhone 4 micro SIMs side-by-side after the break.

So does all this hocus pocus actually work? In a word, no. We tried it on a few of our particularly bad iPhone 4s -- the ones that consistently demonstrate the issue -- and achieved no meaningful results. We even went so far as to line the edge of one of our trimmed micro SIMs in electrical tape (pictured above) to ensure that no contact was being made, and we were still able to flatline the phone using the "death grip." Sorry folks -- we wanted this to work too, but it looks like people are just being hopefully optimistic. We'd say the real fix is going to have to come from Apple -- and given the growing discontent over this relatively severe issue, the sooner the better.