Feeling pressure from Verizon and T-Mobile, AT&T and Sprint have both expanded their unlimited data options, but there are caveats associated with both. Those hoping to attend Apple’s Worldwide Developer Conference in 2017 can look forward to a return to San Jose in June — the ticket lottery will open in late March. Developer Rogue Amoeba has released SoundSource 3, a simple yet powerful audio device management app for the Mac; Josh Centers shares how you may be able to get it for free. If you’ve had trouble with PDFpen crashing on launch (or with 1Password or Soulver), Adam Engst explains what’s going on and how to fix it. Finally, about a year after Apple added imperfect iCloud support to iBooks, ebook maven Michael Cohen revisits his criticisms from a previous article to see which Apple has resolved and which remain. Notable software releases this week include ScreenFlow 6.2.1, GarageBand 10.1.6, Parallels Desktop 12.1.3, and Microsoft Office 2016 15.31.