Agreed. Also, never go for "unlimited" data packages...unless you prefer your broadband served throttled. They work on the "Chinese Unlimited Menu" method. First and second portion, full size, then gradually shrink the ribs with every subsequent portion.
Incidentally me and a bunch of mates put this to the test in The Yangtze in Windsor. My extremely large African friend (whos favourite flavour of ribs is "unlimited") kept going until the waiters started sweating. It got to the point where they were bringing out single ribs. I shit you not.
Mobe providers are the same with "unlimited" tariffs. Theres a sweat point where they apply restrictions and limits (ironically) just in case we try to get our moneys worth.
I promise you, if you use an unlimited sim for a day flat out (just loop a load of speed tests) it will make the data connection virtually unusable for the rest of the month.