Where on earth are you living with that kind of price point? Unreal.
US plans just aren't comparable as they've been historically f'd with astronomical monthly payments.
Orange Yoxo is the only one which has actually-unlimited, all the others have a fine-print somewhere with "up to X GB/month, then bandwidth is severely throttled".
I'm using the 4.9€ plan for a mountain webcam[1] and they have been true to their word, no throttling so far.