I live out in the sticks and was devastated to find I couldn't cheat without wifi- but persistence has paid off.
Without wifi: Have all your sims busy (mine make danish's for speedy xp)
Close and exit the sims in your 'windows' bar by holding your icons and tapping the red - button.
Change date and time 1-3 months ahead
Switch to airplane mode
Open the sims- it will ask you to retry as there is no connection. Tap the retry button 3 times.
Turn off airplane mode and press retry again
You should get 50000 siimoleans, your sims will be inspired and all tasks complete.
Please give feedback- as I'm still testing it.