What is the difference between Apple iphone 4 and Apple iphone 3G

Reasons and methods:

1. The 4G network is not opened.

The phone was not changed to a 4G SIM card.

Or if the 4G network is not opened, the 4G network can only be used if the 4G is generally turned on, and the operator can be consulted in this case, whether the mobile phone card has opened the 4G network, and whether the 4G service has been opened. For Unicom telecom card, in fact, there is no need to change the card, and you can directly upgrade the 4G network.

2. The area is not in the 4G signal coverage.

Make sure that your iPhone is using a SIM card that supports 4G network and has enabled 4G network, but after turning on 4G network, it shows 3G network, which is mostly caused by no 4G signal coverage in your area. Ask your local regional operator if they cover 4G in the area.

Extended Information: Bugs where mobile phones sometimes change from 4G to 3G or 2G:

1. The strength of the mobile phone signal is related to the environment in which the mobile phone is located, and it is difficult to receive the mobile phone signal in some places with strong shading, such as in the basement or in the elevator.

2. The density of the building will also affect the strength of the mobile phone signal, and the more complex the layout of the building, the more difficult it is to receive the signal.

The iPhone 3 is a smart phone. However, multitasking is not supported.

Features: iphone4 is well known, front camera, back 5 million pixel camera, which is a leap in 3. 4Support multi-tasking operations, for example, you can't chat with **, but 4 can.

The A4 processor used by the iPhone 4 speeds up the Internet access. The iPhone 4 screen is a little smaller than the iPhone 3 because of the increased resolution.

And add visual technology to see the dot matrix. Like other iPhone brands, the 4 still doesn't support FLSH

Design: The back of the 4 is horizontal, not as sleek as the 3 (not easy to fall off) and the audio keys below are also treated with soft plastic and tempered to the screen. Baking paint is a piano paint with a bold treatment.

Technology: A4 processor, 5 million rear cameras, almost like a digital camera. Three-axis scrolling is added to make the operation more sensitive when playing games. And it supports multi-tasking operations.

Upstairs is right.,But it's not an upgrade.,And it's a big leap forward.,The screen resolution is currently the first with 4S.,It's the highest before or now.,Processor chips, etc. are all Korean parts.,You'll know it when you play.。

Yes 3G is a SIM card that runs faster than 2G.