To do this, you must completely finish the game by uncovering all the secrets of the phone's owner, Sam, and following their wishes.
If you are completely stuck at any point in the game, below is a guide, but beware of spoilers if you click. It includes all passwords and how to actually end the game.
*** Spoiler - click to reveal ***Melren's WiFI code.
The code is Melren's zip code, found in the weather app.
Sam-Thing lovbirds password.
Sam's birthday, 0131.
Sam-Thing else lovbirds password.
The day of the "book festival", 1219.
VIP section of the forum
First, get the code wrong three times to generate a "Forgot your password" type email. It will ask you the year of birth of Sam's father, 1961, and then generate a random code you can enter.
Sending the right picture.
On the VIP section of the forum, Sam posts a lot of photos from the festival. Sam herself is actually the only one with blue eyes, so download the picture and send it to Phil-free.
The secret app
Type in Covonia's zipcode into the calculator app. Remember zip codes are found in the weather app. Press enter to get into the hidden part.
Getting the ending
Read the whole diary. An Email will pop up. Read it.
Alice will ask you to wipe the phone's data completely. Go to settings to "Erase all data" and you will get the true ending.
May I add this is a truly beautiful and underrated game.