How to change my passcode on my iPhone without having access to it?

My mom took my iPhone from me, she knows the passcode. Is there anyway I'm able to change my password without having access to my iPhone?

Nope, not the screen lock code. Better make amends with mom.

But if you want to lock the phone and have already set up Find my phone, you can do that from another iDevice.

Contct iphone customer care and support team they will do it for you.

No you can't try to make up with mum otherwise if you have Find My Phone app on the phone or any other anti theft app you can remotely lock it or erase all the data on the phone from the Icloud website.

But it will only if it's connected to Wi-Fi or Mobile Internet