Yes, also should add it to the register form when you first make an account so that you can use it in the recovery process through the Contact feature.
Seems to be alot of problems with people forgetting old passwords and accidentally logging out.
Not many people forget what their old phone numbers are (if their number happens to change)

Only downside is that some people have friends (even internet friends) whom they have shared their personal phone numbers with, and this could cause some security problems.

This post was edited by straightedgerevenge on Jan 8 2014 08:30am

Thanks
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Would add costs to jsp (Paul), right?
could be easily abused.

No.

Even if there's no cost to jsp, there would be a cost to the user receiving the message.
This could be abused if someone tries to recover your account.

This post was edited by Ante0 on Jan 10 2014 09:09am

Thanks for input.

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Big yes from me
I usually dont post here, just watching the topics sometimes
Seeing all the account recovery problems in general help this would be really usefull.

Thanks

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Bump