If you bought the Sony Z1s on T-Mobile you were probably disappointed to learn that it has a locked bootloader and is therefore currently unrootable. Unfortunately, T-Mobile requested Sony to lock the bootloader. The non T-Mobile exclusive version, the Sony Z1, has an official method of unlocking the bootloader courtesy of Sony.
T-Mobile has stated that locked bootloader is necessary because rooting the phone voids the warranty and users may install software that can harm the device.
Every user that roots accepts the their warranty may be voided and that the device may be harmed.
The vast majority of T-Mobile devices do not have a locked bootloader and can be rooted.
This is a surprising and very disappointing move by the so called "uncarrier".
Please sign this petition which will be sent to the Executive Response team at T-Mobile.
96 people have now signed! Keep spreading the word! So close