Normally when I go offline on Facebook, a little mobile icon shows up next to my name saying how long I've been offline, and I loved that because my friends could tell if they needed to text me on my phone or use the chat box. Now all of a sudden, the mobile icon has disappeared from my name when I'm offline, even though I have 2 Facebook mobile apps and my phone number is also available on my profile. I just want the little mobile icon back, so my friends could know how long I've been offline and stuff. Please help 