You also have WiFi, so stop worrying!
1gb / month is plenty for general browsing, some youtube, occasional downloads & the sync stuff on androids. It's when you want constant connection for like, streaming media & online gaming, that you'll need more.
Dunno what your provider is like, but tariffs in UK are "unlimited", meaning that we can't really go over our limit if you're 'playing by the rules' - ie: if we're casual users (see above) then 1gb is enough.... if we do the intensive stuff then we might need more, indeed, they might text us to say we're using too much data & might like to upgrade to a higher tariff. I think it's got more to do with how much bandwidth we use at any period.
Also, our monthly or longer tariffs generally have faster speeds than daily or weekly tariffs.
I also have a Huawei E585 MiFi for mobile broadband - 1gb / month is usually ok, unless I want to stream music (internet raio, etc...) then I need a 3gb / month. HTH