What is Reddit's opinion of Calculator?
From 3.5 billion Reddit comments

➔ Calculator website

By popularity on Reddit, this Service is:

#32 in Calculator apps

1 review of this app found across Reddit:

Huh? The iPod touches have Bluetooth? The iPhone doesn't even have FM.

The iPhone also supports tethering natively? I'm not sure where you're getting your talking points from, but, they seem to be quite wrong.