O₂ 3,5 GB Allnet Flat: with My Prepaid S (see below): €9.99 O₂ 6,5 GB Allnet Flat: with My Prepaid M (see below): €14.99 O₂ 25 GB Allnet Flat: with My Prepaid L (see below): €19.99 O₂ Unlimited (999 GB domestic FUP) Allnet Flat: with My Prepaid Max (see ...