In my experience, 4GB monthly cap is too little if taken as an argument for LTE. Recently I’ve downloaded a traffic monitoring program and it became apparent that just opening Facebook takes ~10MB, let alone Youtube videos. In my opinion 4GB would be enough if all I do is email checking and some very simple browsing/downloading?I have hotspot support with my phone cell plan but my carrier is only charging me CAD$5 / US$3.60 / €3.30 a month for a dedicated tablet plan with 4 GB per month.
It’s hard to argue with $5 per month for the convenience.
I also have an SE. Half-an-hour viber video call consumes 1GB traffic and the phone heartbeat (email+viber in background mode) consumes around 15MB a day. Start a viber chat and your MB will jump up. It seems viber calls consume less traffic than chatting.
In that regard, the MacRumors forum is very frugal and consumes just a few MB per opening.
Of course, after the initial opening of the webpage, the browser caches most of the data so that further pages are not so mammoth-like.