Steam has now added phone number association with steam accounts.

I need to read the TOS before I add my phone number to it...last thing I need is to give them permission to spam me with text messages or me agree to them selling it to telemarketers. I wouldn't suggest using it right away till you know more about what is going on with it vs just another level of account security.

I added my phone number. No problems yet- no spam messages.

I think is good feature as long as they don't sell the number to Telemarketers.

I don't forsee a big issue with it really....if they did what I mentioned then they would likely have a s✿✿✿ storm from negative feedback and privacy issues.
I'll wait a while before using it as I'm not concerned one bit about my account. I don't do stupid things to put it in a position to be stolen/hacked or what not.

Valve continues to do good things and bad things when it comes to responsibility of an end users account.... I still dislike the damn email verification nonsense being defaulted on to everyone. Good idea but not implemented well IMO, should have been prompted to everyone to click YES or NO to enable it vs how they did it.

Is it too late to ask for in game TF2 trading to be returned?

They continue to push off the responsibility on to the end user in some form. I don't think they can deny you help if you don't add a phone number as not everyone may have a phone or wish to add it. Hijacking shouldn't be happening if people would slow down and take their time clicking on things, checking sites etc... This is me talking too as I feel its no excuse if you slowwww down and pay attention vs being in a rush to make a trade or "get a good deal". A good trader/honest trader will take their time and if the other person needs more time to think about the trade then so be it...when you rush accidents happen

Hear hear!

I've had it since it was released, doesn't look like they've sold my number to telemarketers; all gone well so far.