The 6-month advance payment is no longer offered by Globe. Are you a regular employee already? If yes, definitely you are eligible to apply. I got my first postpaid Plan when I was at my 7th month on my company.
If you'd like to get a plan with a free mobile phone, application requirements are as follows:
Proof of Identity (POID)
Proof of Billing Address (POBA)
Proof of Financial Capacity (POFC)
Just a note: The amount in your POFC should be commensurate to the value of the plan you're applying for.