Please take away

(for android - and probably very similair for other devices....) go into 'settings', then 'genera'l tab. Scroll down to and open 'date & time'.  Then UNcheck 'auto-date & time'.  Change the date three days ahead or more.  Then open game.  You will now see next set of levels is unlocked. (you can do this same thing to get lives back!!)

Now this is important---  BEFORE you start playing, go back to date & time, and put auto back on.  If you don't its a pain in the a$$.  First, if you play and you're out of lives then fix the time later......  the game will want to catch up before you get your lives again.  (aka - 68h 58min before next life or whatever....)      ALSO - (at least on my phone) if I send/receive any texts while the time is not set right, its all messed up.  Conversations are out of order, old messages stay on top of the conversation until real time catches up.....and its really just a pain.  So try to remember to set it back correctly before playing!  Hope this helps!