Sometimes, your personal items like your phone, expensive gadgets, bag, wallet, etc. might be stolen. This is a crime under the law1, and the thief can be punished with jail time of up to 3 years and/or a fine2.
Further, in case other factors are at play during the theft, such as a house break-in, then different punishments will apply.
If any of your personal items have been stolen, read here to understand the steps/options you can take to complain.