Data usage AND Browser Back Button?

[Gunnar]

1.  How accurate is the data tracker?  I call DATA from my phone and get the usage via text, and check the Verizon site and they are both the same, HOW accurate are they?  In other words, am I getting a surprise at the end of the month?

I have used 1.2mb out of 75mb.

2.  Is there a back button for the browser besides the touch one?  Like a physical button or button sequence?

Thanks all!

[LatachaM_VZW]

The data information on My Verizon and #DATA refreshes within 45 minutes of the data transaction. In some cases, it may be delayed over 24 hours due to system delays. 

Thank you, LatachaM_VZW