That's cos normal web browsing isnt likely to even cap 1Mbps. Not unless you are just downloading something or streaming videos or high quality audio. The only time internet browsing will cap my nonexistant 1Mbps home internet is when I open my browser that opens up 5 tabs at once at it loads em all at the same time
Isnt the 42Mbps for LTE/4G though, which afaik 710 doesnt have? Also it's still theoretical and depends on how many people are using the network in addition to you.