How to put Note 4 OS 4.4 in Service Mode

Type 
*#0011#
On the top right on the screen has 3 dots, click on them
Select " Back"
Click on the dots again and now select "Key Input" and type "Q"
Click on the dots one more time select "Key Input" and type "0000" and wait a few seconds

How to hard (factory) reset BLU Studio 5.5 D610a

Make sure the battery it's charged at least 20% because it takes a few minutes to complete the operation.

Turn the phone off 
Press volume down and power button at the same time
Your phone will show "FACTORY MODE" and a list of commands,choose "Clear eMMC"  and wait a few minutes.

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How to hard reset LG G3 D855

Solution 1 (Factory reset via menu )

• Open Android Settings
• Tap Backup & reset
• Tap Factory data reset
• Tap Reset phone
• Tap Erase everything

Solution 2 (Hard reset via buttons )

There are THREE different options to make a hard reset via buttons. Only one is for your phone. You have to try out all to find out which is yours, because it depends on your exact Android version.

Option 1

• Power off the device and wait 10 seconds
• Press and hold the Volume Down button and the Power button

• When the LG logo is displayed release BOTH Buttons then immediately press and hold the Volume Down and Power buttons again.

• Release both buttons when the Factory data reset screen displays.
• From the Factory data reset screen, select Yes. Use volume keys to navigate.

Option 2

• Power off the device and wait 10 seconds
• Press and hold the Volume Down button and the Power button

• When the LG logo is displayed release the Power button only then immediately press and hold the Power button again.
• Release both buttons when the Factory data reset screen displays.
• From the Factory data reset screen, select Yes. Use volume keys to navigate.

Option 3

• Power off the device and wait 10 seconds
• Press and hold the Volume Down button and the Power button

• When the LG logo is displayed release BOTH Buttons then immediately press and hold the Volume Down and Volume Up buttons.

• Release both buttons when the Factory data reset screen displays.
• From the Factory data reset screen, select Yes.

Set up new APN on Samsung Ativ Odyssey I930

Go to settings and scroll up until see APN, select APN ,you will see 3 dots at the bottom right ... ,click on it and it will show (add new access point) click on it and type the new APN and save