I think if this wallet want to be secure it should have mobile verification for ongoing transaction
We already have Google Authenticator based 2FA to be a better security measure. You can enable the same by clicking on "Security" on your ethx Dashboard.
Google 2FA is available for login and crypto withdrawal confirmation as well.
Why can't I verify my number, you Guy's should look on that as well
Our team is working on resolving the issue during mobile verification.