Default Root without unlocking bootloader?

Hi,
because of warranty I don't want to unlock my bootloader. Is there a way to root the device without onlocking the bootloader?
History: Philips Savvy -> Trium Galaxy -> Siemens S25 -> Ericsson t68 -> Nokia 6230 -> SE w810i -> SE w890i -> iPhone 8GB -> Nokia N79 -> HTC Touch Diamond2 -> HTC Legend -> HTC Desire S -> HTC One S -> Sony Xperia Z1 Compact