Mobile-only followers dont receive updates via SMS

I'm organizing event and I just have some users following it by SMS - they text "follow user" to +4476.... but no one has received any updates I have sent. Only users who have real twitter account and have turned-on device updates on twitter.com received them.

I have twitter account and tried following EventUser by sending sms "follow EventUser" to twitter (+4476...), I also didn't receive update. Then I noticed on the web interface that I am following the user but that my device notifications are off. Maybe that's happening to Mobile users... do they really must send another sms message to turn it on or should "follow EventUser" be enough?

Update: after mobile-only users sends "on EventUser" he starts getting updates. I hope this is bug that will get fixed.
 
sad I’m frustrated
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