my mobile phone has been stolen. may be by a classmate.

[🦜Cloud Boy🦜]

If someone stole my mobile phone but do not know my steam password or email password can he gain access to my steam account? just by stealing my phone? by the way i have mobile authenticator activated.

[Tev]

If the phone number was tied to the account, which it likely was then he could look up your account name from the Steam Guard -menu on the phone and go here for [Forgot your password] on the Steam's Help Desk -page to have the recovery sent via SMS instead of via e-mail. https://help.steampowered.com/en/wizard/HelpWithLoginInfo

In otherwords, yes he could.

https://support.steampowered.com/kb_article.php?ref=8625-WRAH-9030

Help, I lost (or sold) my phone and can't log in! What do I do?
If possible, you should contact your wireless service provider and get a replacement phone with the same phone number. Steam will be able to send SMS messages to your replacement phone, and you will be able to recover your account as described below.

If you no longer have access to your phone and don't have your recovery code, you'll need the assistance of Steam Support. Use the "Contact Steam Support" button at the top right of this page to get help removing your authenticator. If you don’t have access to the email address that is currently associated with your Steam Account please provide proof of account ownership within your ticket.

[ReBoot]

Początkowo opublikowane przez Eagle:

If someone stole my mobile phone but do not know my steam password or email password can he gain access to my steam account? just by stealing my phone?

If your phone is protected, he can't do anything with it anyway.

[Tev]

Początkowo opublikowane przez ReBoot:

Początkowo opublikowane przez Eagle:

If someone stole my mobile phone but do not know my steam password or email password can he gain access to my steam account? just by stealing my phone?

If your phone is protected, he can't do anything with it anyway.

The instant I switched to Android, immediately enabled App Lock in addition to the regular password protection. :)

[ReBoot]

Początkowo opublikowane przez Teutep:

Początkowo opublikowane przez ReBoot:

If your phone is protected, he can't do anything with it anyway.

The instant I switched to Android, immediately enabled App Lock. :)

I mean the access PIN and SD card encryption. Those are the two to enabe.