iphone 4

iphone 4 is one of the most selling mobiles in 2010. 
here is some details of iphone 4

Technical Highlights

Droid Incredible                                   iPhone 4

Android 2.1 + HTC Sense                   iOS 4
3.7" AMOLED 480x800                    3.5" LCD IPS 640x960
Qualcomm 8650 SnapDragon,            1Ghz Apple A4, N/A
512MB RAM 5                                  12MB RAM
8GB internal + microSD slot                16GB of internal storage
8 Megapixel camera                            5 Megapixel camera
Wifi b/g, BT 2.1+EDR, aGPS             Wifi b/g/n, BT 2.1+EDR, aGPS
FM Radio                                           No Radio
TV Out (microUSB)                           via iPhone connector
Carrier: Verizon,                                 3G speeds AT&T
4.6 x 2.3 x 0.47", 4.6oz                      4.5 x 2.31 x 0.37", 4.5oz
1300mAh battery                                N/A

positive

1.design {very good}

2.battery life {extremely good}

3.display {perfect}

4.basics {good}

5.multitasking {awesome}

6.performance {very good}

7.gaming {awesome}

8.facetime {impressing}

9.price {depends on you}

negative 

1.email {bad}

2.syncronization {ok-ok}

3.video {FAIL}

4.speaker{really bad}{as usual}

conclusion
The iPhone 4 is an excellent smartphone, the best one in fact. This is quite a step up from the iPhone 3GS, thanks to the display and the many improvements in the OS. If you don't have an iPhone but want to get one, I would recommend the iPhone 4 over older models, despite the antenna issue. If you are thinking of saving $100 by going with the 3GS, take a good look at the total cost of ownership over 2-years. You might realize that $100 is not that much of a stretch if you consider that you will be using the device *everyday*. Instead, cut down on yourStarbucks consumption to make up for it. The pricing of the iPhone 4 is very comparable to other smartphones, so I don't think that pricing should be a decisive factor. Instead, the design, user interface, app library and responsiveness will determine if it works for you or not. If you are afraid of the "death grip" issue (read above), wait until a permanent solution is found, but going straight to a 3GS would be a mistake.