I lost my iPhone and my twitter/instagram account is still logged in?

What do i do so the person who stole my mobile can't access my accounts?
will changing the password help?

Well… There's a couple things… You can delete your twitter instragam stuff obviously. Or, you can use the find my iphone app to find where you lost it (by using email and apple website). Doing this can also add a remote lock to it. Lastly, if you change your password and such it should be fine.

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