Hi,

what exactly do you want to change?

The guarantee does not apply in such a case.

Good morning @Andreea.Liubici 
Oh dear, more than annoying that your phone now has a broken screen 

I can only give you the same answer as Sandroshubert already told you. Display damage is your own fault and is not covered by the warranty.

You can send it to us for a fee and have it repaired at a workshop authorized by the manufacturer, or you can go to a cell phone doctor of your choice.

Best regards

Kathi 

@Andreea.Liubici  I can tell you, that you dont have any guarantee when your cellphone felt down and cracked. Neither O2 nor Xiaomi will repair this on their costs.. you have to pay this by yourself. Thats a fact.

I'll give you another advice. Have the device repaired at an authorized repair center and not at some backyard workshop.. 

You might save €50 but in the end you will sacrifice the quality

Thanks for pointing this out @Libertas 

In any case, have it repaired in an authorized repair workshop, which works with original spare parts. So that the guarantee remains intact 

Greetings

Kathi