What is Data rollover?

Data rollover means unused data carries into your next billing period instead of expiring on the day your plan renews. The brands here split cleanly. 2degrees, a1 Hrvatska and ALDI Mobile all offer rollover, while 50plus Mobiel and A1 Serbia do not. For a light user who mostly browses and messages, rollover quietly adds real value across a whole year. For a heavy user it rarely matters, because the allowance goes in any case. Check it before you pick a smaller plan to save money.