Cheat for unlimited money. Works after march 2013 update
Note: you need neighbours for this!
Connect your sims freeplay to Facebook and make sure you have neighbours. Go to the furniture store and go to the neighbour tab. Buy the most expensive thing there (won't actually cost any money!). Buy as many as you like. I recommend starting with putting like 10 of them in your house.
Disconnect your Sims Freeplay from Facebook (you might have to close down the sims freeplay completely first before you can go on). Then go back to the house and you see you have no neighbours. You now can sell every one of those 'neighbour furniture' for simolleons.
Repeat the process to get more money.
Added by: Nicolematthewsx Apr 4th 2013, ID#2137