The simplest method to know your balance is to give a missed call from your registered number to 011-2290-1406 .
Also keep in mind:
1) If you go 2 months without employment, you are currently eligible to withdraw 100% of your PF balance
2) If you withdraw the PF balance before completing 5 years of service and if the PF settlement is equal to or exceeds Rs.30,000, you will be subject to a TDS of 10% with a PAN card and 34.608% without a PAN card at the time of settlement.
The withdrawal procedure, you can find here:
Get your Provident Fund UAN - A guide for employees