So many carriers around the world do give unlimited
@SiVell Can you mention few wireless carriers which gives unlimited data on 4g without FUP??
Dunno about other countries, but all leading U.S. carriers (mobile service providers) offer "unlimited", but with a caveat. Unlike India, the concept of Net Neutrality was already wobbly under Obama and then-FCC chairman Tom Wheeler, but Trump-appointee Ajit Pai has been trampling on Net Neutrality norms with impunity.
So Verizon, AT&T, T-Mobile and Sprint are all offering "unlimited", but with video streaming restricted to either SD 480p (16:9 aspect ratio, FWVGA 854 x 480 resolution, not standard SD 800 x 480) or HD 720p depending on the subscription option. Also, tethering is restricted to 10GB on Verizon and 21GB (I believe) on T-Mo, thanks to the FCC's complicity, allowing carriers to differentiate between usage, which, once again, goes against Net Neutrality norms.
Either way, Verizon calls its unlimited plan 'Verizon Unlimited', starts at $80, T-Mo calls it 'T-Mobile One', AT&T named it 'AT&T Unlimited Plan' and Sprint named it simply 'Unlimited'. All plans come with unlimited voice, SMS and data, but only when used on mobile, with low-res
Netflix, YouTube, Dailymotion etc. Of course, you may optionally choose to watch full-res videos, but that will then count against your FUP. So 'Unlimited' is not really unlimited, but a farce for the most part.
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Sorry about the long answer, but hopefully that clears it up.