All perfect praise be to Allaah, The Lord of the Worlds. I testify that there is none worthy of worship except Allaah, and that Muhammad is His slave and Messenger.
It is permissible to enter the toilet with this phone especially when one fears that it will be stolen if it is left outside because when the phone is switched off, it will not sound with the recitation of the Quran.
This phone does not have the same ruling as the Mushaf (the Arabic text of the Quran) so that one would say that it is disliked or forbidden [to enter with it to the toilet].
For more benefit, please refer to Fatwa 85539.
Allaah Knows best.