2 Answers

See all rules here> http://richard_wilding.tripod.com/monorules.htm

Jail rules here>http://hasbro.custhelp.com/app/answers/detail/a_id/806/~/getting-out-of-jail

  According to the Monopoly rules, A player gets out of Jail by...
Throwing doubles on any of his next three turns. (If he succeeds in doing this he immediately moves forward the number of spaces shown by his doubles throw. Even though he has thrown doubles he does not take another turn.)Using the "Get Out of Jail Free" card if he has it, Purchasing the "Get Out of Jail Free" card from another player and playing it  or Paying a fine of $50 before he rolls the dice on either of his next two turns.

If the player does not throw doubles by his third turn he must pay the $50 fine. He then gets out of Jail and immediately moves forward the number of spaces shown by his throw.

Even though he is in Jail, a player may buy or sell property, buy or sell houses and hotels and collect rents.

you can't get out of jail unless you draw a get out of jail card from chance or the communtiy chest.