What does a late payment mean for my deposit?

[Unfath]

I paid a £225 deposit at the start of my contract 3 months ago. My first payment was slightly late due to not realising that I would be charged in the middle of the first month that I got the phone. (Not sure what thats about either, why are we charged the full monthly fee after only having it for 2 weeks?) The other payments have been on time. Will I still get my full deposit back? Any help would be appreciated.

[Bambino]

@Unfath It would probably be best explained by @O2Richard or @O2Simon

[MI5 · Accepted solution]

@Unfath 

You need 3 payments on time and it will be returned on the following bill if you call to request it. 

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[O2Jordan]

Thanks @MI5 Thats correct,

@UnfathYou pay two weeks into your contract as you pay a month in advance, @Bambino was correct you need to have 3 months clear billing, once this has past any deposit will then be placed on to your fourth months bill.