Manual entry (or more options) for data on calculator
Say you know you average 700 MB of data, so you know that a 750 MB or an 1000 MB contract are good for you. You are currently forced to choose 1GB (1024 MB). That means that some contracts that provide 750 MB or 1000 MB allowances have add-ons slapped on to cover them to 1024 MB. This makes the contracts appear more expensive than they would actually be for you.
I'd like to see a manual entry field (like for minutes/texts) or more options in the pull-down menu. Either way, you can still leave the recommendations for people who don't know how much data they might need.
There are now more data options to choose from in the calculator, corresponding to the most commonly available data allowances in current tariffs. I hope that helps!