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[Bernloub]

Hello, I'd like to know how to add the auto answering on my device (Sony Xperia M5)
BTW I'd like to know how to add a contact on a key to simply press the key to call the contact saved on the key.
It really annoys me.. I don't find these options
Thx in advance, regards

[Uliwooly]

@Bernloub

Which Xperia do you have? 

Also, you can download apps to customize your phone, embrace Android

[Bernloub]

Thx for the fast reply, I have a Sony Xperia M5

[Uliwooly]

@Bernloub

It doesn't seem that you can set contats to numbers BUT you could tap on the star icon and you will see certain "star" contacts

You can also set a widget > top contacts 

or 

download a third party phone app.