I am from Mexico and the UMI Z hasn't come yet so there are no places to repair it, what websites do you recommend me so they can repair it?
Please help, I really need to use my phone
I don't understand what you talking about! As you saying that you need repair your phone but phone didn't come yet.
Here you can buy screen https://m.aliexpress.com/search.htm?keywords=Umi+z+lcd#/
And then you can take new parts and device to any smartphone repairing centre or store for repair.