Just €99 up-front.
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That equals roughly $1047, but you'll be paying it in installments through O2's My Handy payment plan. All that's needed is a €99 deposit and 24 payments of €27.50. Honestly, that's a really nice way to handle carrier subsidy. You end up paying way more (over time) for a contract phone than you'd pay for just buying one unlocked. At least O2 is upfront about what is going on.