How is the performance of the Apple F4?

Due to design flaws, many iPhone 4 users have found that the mobile phone signal will suddenly decay or even no signal when their iPhone 4 is held in their hands. That's a big problem.

The iPhone 4 signal issue was not only made a big fuss by rival Nokia, but even nearly caused a class action lawsuit in the United States.

In the shutdown state, the Apple iPhone 4 actually appeared with a macular spot that can be distinguished by the naked eye. On a white screen, we can also see a very noticeable color cast. It seems that if you want to dominate with the screen, the iPhone 4 is very hanging.

If you often accidentally drop your mobile phone or other things to the ground, then don't buy the iPhone 4, because after the free fall test of the iPhone 4 abroad, we found that the Apple iPhone 4 is really too can't help but fall. It was a serious injury after only 1 meter of height.

Although we don't buy mobile phones to fall, bumps and bumps are inevitable. We don't want the phone to be stronger than a stone, but the screen will be smashed at a height of 1 meter, which is obviously a design flaw of the iPhone 4. [

iphone4?The performance is average, the touch screen experience is very good, and if you can install the application, you will go to research, it is still very powerful.

Apple does not have the Apple F4 model.

There are two models under the Apple 4 generation, the Apple 4 and the Apple 4S, and the Apple 4S is an upgraded version of the Apple 4.

The two machines have been on the market for a long time, and if they are running iOS6 and iOS7 systems, they still run relatively smoothly.

Apple's newer Apple 5s, Apple 6 and other features are not supported, such as fingerprint unlocking Apple 4th generation.

What is the difference between the beginning of Apple's serial number N, M, and F, and which is a brand new machine? What kind of machines are those two?

Apple's serial number starts with M is a new original machine, N is an official replacement machine, and F is a refurbished machine.

Serial numberPlace of Origin C: Place of Origin Shenzhen D: Place of Origin Chengdu F:

Place of Origin Zhengzhou Model M: Original machine (including new machine, old machine, second-hand refurbished machine) N: Official refurbished machine (replacement machine) F:

Officially certified pre-owned phone (the case is not guaranteed to be new).

It is a refurbished machine. The beginning of M is a new original machine, N is an official replacement machine, and F is a refurbished machine. f：

The only difference between the official refurbished machine model and the official refurbished machine is that the official refurbished machine is officially recognized by Apple, and it is also manufactured in strict accordance with the factory inspection standards. N: The sign of official replacement is also a major criterion for judging official replacement.

M: Retail machines are all like this.

The serial number of the Apple mobile phone at the beginning of M represents a brand-new machine, the beginning of N is the official replacement machine, and F represents the official replacement machine, all three of which are machines with official channels, all of which can enjoy the official after-sales guarantee. The following is a detailed introduction: 1. The serial number M starts with the original, brand-new machine; The serial number starts with N for the official replacement machine; The serial number starts with F to represent the official translation.

The beginning of M is a retail machine, and the beginning of N is an official replacement machine. This is the same concept as the replacement machine, that is, the problematic Apple mobile phone is sent to the Apple repair shop, and Apple directly replaces a new mobile phone to him, which is usually a mobile phone that has been activated a long time ago.

Mobile phone serial number difference: the meaning of the beginning of f c d.

F: Zhengzhou Foxconn.

C: Shenzhen Foxconn.

D: Chengdu Foxconn.

The beginning of the Apple mobile phone model n is the official replacement phone, and the mobile phone that starts with M is the normal listed mobile phone. f stands for the official replacement machine.

The third f should be a new machine.

Does it start with the model number fg or the serial number fg? The model M starts with a new machine, N starts with an official replacement machine, and the FG Hong Kong version of the refurbished machine, and the serial number F begins with Zhengzhou Foxconn production.

The model number is on behalf of the retail machine and the official flip machine, and the serial number is on behalf of Shenzhen, Chengdu and Zhengzhou.

You can find it on Apple's official website, or call **Apple customer service to ask.

n is refurbished, normal is m, f is brand new!

n starts with a brand new machine or a refurbished machine.

Serial number F starts with what machine.

Generally speaking, there may be some differences in the model, you can open it and take a look.

It's very cheap now, more than 2800, anyway, you can buy it for less than 3000

1. The first 6 digits (TAC) are"Type approval number", generally representative models.

2. The next 2 digits (FAC) are"The last assembly number", generally representing the place of origin.

3. The next 6 digits (SNR) are"Serial number", which generally represents the production sequence number.

4. The last 1 digit (SP) is usually"0", which is a check code, is currently standby.

For example, the first letter of the iPhone serial number starts with "C" for Shenzhen, "D" starts with Chengdu, and "F" starts with Zhengzhou.

The fourth digit of the serial number represents the year of production, which is represented by 20 letters (excluding a, b, e, i, o, and u from the 26 English letters), note that it is rounded every six months.

c" for the first half of 2010 and "d" for the second half of 2010;

f" for the first half of 2011 and "g" for the second half of 2011;

H" for the first half of 2012 and "J" for the second half of 2012;

"K" for the first half of 2013, "L" for the second half of 2013 (5S sale);

m" for the first half of 2014 and "n" for the second half of 2014 (6 releases);

P" represents the first half of 2015, and "Q" represents the second half of 2015 (6S sale);

r" for the first half of 2016 and "s" for the second half of 2016 (7 releases);

t" for the first half of 2017 and "v" for the second half of 2017;

"w" represents the first half of 2018, and "x" represents the second half of 2018;

y" represents the first half of 2019, and "z" represents the second half of 2019; (and so on).

c" for the first half of 2020 and "d" for the second half of 2020; (Circular Letters).

The fifth digit is represented by numbers (1-9, minus 0) and letters (26 letters minus a, b, e, i, o, u, s, z), a total of 27, representing the number of weeks, starting from 1, counting the number of digits, every six months a cycle:

1" represents Cycle 1; "2" represents the second cycle.

"3" represents the 3rd cycle; "4" represents the 4th cycle.

5" represents the 5th cycle; "6" represents the 6th cycle.

7" represents the 7th cycle; "8" represents the 8th cycle.

9" represents the 9th cycle; "c" stands for Cycle 10.

d" represents the 11th cycle; "f" stands for Cycle 12.

g" for Cycle 13; The "h" stands for Cycle 14.

j" stands for the 15th cycle; The "k" stands for Cycle 16.

l" stands for the 17th cycle; "m" stands for Cycle 18.

n" for the 19th cycle; "P" stands for Cycle 20.

q" stands for cycle 21; The "r" stands for Cycle 22.

t" stands for Cycle 23; The "v" stands for Cycle 24.

"w" stands for Cycle 25; The "x" stands for the 26th cycle.

y" stands for the 27th cycle;

The iPhone serial number will be arranged according to the production batch of the phone, the place of sale and the iPhone phone model.

There are two types of serial number arrangement formats, namely: AAA B C DDD EEEE and AAA B C DDD EEEF.

<> equipment has expired the warranty period, and the clever cherry blossoms are accompanied by Hui.

It can be found on the official website, and it should be true.