sophone help about language, music and internet. (English)

[sonic007m]

Sophone not starting

Hello,
I got a sophone 4s and it worked fine.
I tried to install gta 3 (android) and i got the first 2 intro cutscenes
Then my phone froze
I turned it off by pressing the +, - and home button
Now it doesnt turn on anymore!
HELP
And please be quick, i am expecting an important call!

 

[Loonix]

can you pull the battery?
mabye it is not realy shut down but stuck.