how can i block my stolen samsung galaxy s3 LTE?

[AC Question]

so they can not use my phone stolen

 

[belodion]

Contact your carrier about it.
Also, Android Device Manager may be useful.

 

[B. Diddy]

Welcome to Android Central! Hopefully, you had a good screen lock set. You should still change your Google password now​, so that the person who has your phone can't easily access your sensitive Google information.