BEWARE OF FAKE SAMSUNG PHONES

How to tell if a Samsung Galaxy S5 is fake:

There are a number of ways to see if any phone is fake, but with the Samsung S5 models, you can look for specific features and specifications that will let you tell. You can also use the Samsung Kies software to check with Samsung to see if a phone is authentic. Here are some things you should look for:

1
Check the distance between the edge of the phone and the screen.
Original Samsung phones use a very high quality glass that is resistant to damage, and unlikely to easily break. Because of this the screen is able to be placed very close to the edge of the phone. Fake Galaxy phones use lower quality components, and will often have a greater distance between the edge of the device and the screen.
2
Screen brightness is not very good.
Low quality displays aren't as bright as the higher quality components Samsung uses, which means that a clone screen will look dull and flat. This is especially easy to see if you're able to compare the phone to an original, such as one a friend may have that you could use to compare.
3
Button distance, gaps, and sensor placements aren't the same as an original.
Many times there will be gaps in fake Samsung devices, sensors will be missing or in the wrong locations, and there will be different distances between buttons and the edge of the phone. A great way to check for this is to visit a Samsung store, and get a copy of the sales brochure for the Galaxy S5. Then, take that with you and compare it to what you are considering purchasing to see if they match up.
Code and IMEI or Serial Number methods to tell if a phone is genuine.

If you are able to touch and use a new or used Samsung Galaxy S5 that you are planning to buy, you can enter any of the following codes into the phone's dial pad. Each of these codes is relevant to a device component, as in the case of a modem. If the test does not work properly, it is likely that the component is not original. Please use the following codes:

Software Version, PDA, CSC and Modem - *#1234#
Software and Hardware Info - *#12580369#
Test mode - *#0*#
Service Mode - *#197328640#
ADC Reading - *#0228#
Bluetooth Test Mode - *#232331#
Bluetooth Address - *#232337#
Samsung Ciphering Information - *#32489#
You can also contact Samsung directly with the IMEI and Serial of any phone to ask for customer support. If you have a fake code, they will not provide support. Alternatively, you can also download and install Samsung Kies, and plug the phone into your computer to see if it is a genuine Samsung Galaxy S5. Fake phones won't be able to be authenticated with the Samsung system.

Samsung Galaxy phones have fixed codes that can be entered to test functions or view information about the device. You just simply input the codes in your dialer app and your phone should respond to it. If the phone does not show any response, then the Galaxy device you are holding is an imitation. These are the most common Samsung codes:

*#06# [Displays device IMEI number]
*#1234# [Displays device current firmware]
*#*#1472365#*#* [GPS test settings]
*#*#197328640#*#* [Service mode main menu]
*#*#4636#*#* [Diagnostic and general settings mode]
*#0*# [General Test Mode]
*#0228# [ADC Reading]
*#0283# [Audio Loopback Control]
*#0289# [Melody Test Mode]
*#03# [NAND Flash S/N]
*#0588# [Proximity Sensor Test Mode]
*#0589# [Light Sensor Test Mode]
*#0673# [Audio Test Mode]
*#07# [Test History]
*#0782# [Real Time Clock Test]
*#0842# [Vibra Motor Test Mode]
*#12580*369# [SW & HW Info]
*#1575# [GPS Control Menu]
*#2263# [RF Band Selection]
*#232331# [Bluetooth Test Mode]
*#232337# [Bluetooth Address]
*#232338# [WLAN MAC Address]
*#232339# [WLAN Test Mode]
*#2663# [TSP / TSK firmware update]