Its been heard that iPhone 4G is having some issues with antenna design. If you recall from the keynote, that’s where the Bluetooth / WiFi / GPS antenna meets its GSM / UMTS counterpart.
One iPhone 4 demonstrated the issue everytime it was held in our left hand (as a right-handed person is apt to do) so that our palm was essentially bridging the two antennas. If we had to guess, we’d say that our conductive skin was acting to detune the antenna — in fact, we’ve already managed to slowly kill two calls that way so it’s not just an issue with the software erroneously reporting an incorrect signal strength.
That said, we had no issues when Apple’s $29 rubber bumper accessory (given to us free for standing in line) was attached, creating a buffer between our palm and the antennas. Our second UK-purchased iPhone 4 was fine, showing none of these handling symptoms.

Bit of relief to Apple users, they have finally a stable (so far) release. This release fixes few important missing features. I strongly recommend all of you to update
to 2.1 iPhone version. Don’t worry if you have jailbreak your iPhone and scared of updating to iPhone 2.1. I would suggest go far it.
I have done it and happy to see few good changes.
1. Finally Apple admitted and tried to fix their call drop problem, which they were throwing away by saying network problem. So in this release they have fixed call failure and call drop issues.
2. If your iPhone is stolen or lost and someone wants to misuse it as you might have stored important information then you need not worry too much. Your data is useless for others. The only required condition is that you have setup pass code. So if someone tries to unlock more than 10 times. iPhone will erase all the data automatically. Be careful, this might get back to you sometimes.
3. Fixed some crash and hang bugs because of 3rd party software.
4. I would really appreciate this fix. They have drastically reduced iTune backup time. Earlier it used to be from 2 mins to an hour or so but now its 90 sec only. This is really one fix that can make you to update to latest version.
5. This could get you bit relief if you are always complaining about battery life. This release includes some fixes to improve battery life.
6. Faster installation of 3rd party software.
7. Repeat alert up to 2 more times for incoming SMS.