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Apple SSL bug: WiFi risk only?

After reading the description of this dramatic SSL bug affecting iphones, ipads & macs, I remain confused:

Is this only relevant if you are on a shared wifi network?

If you are on cellular 3G,LTE or on your private wifi at home, how is this relevant?

I have several ipad users (IOS6) who have refused to upgrade to IOS7.

Is this SSL issue a compelling reason to do so? (A patch is not available on IOS6 for iPad2 / iphone 4).

Thanks,
Mike
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This is the answer I got elsewhere which makes the most sense:

I got my answer.  Bottom line: Tim is right, it's not about the wifi.

"It matters anywhere. This isn't someone being able to "snoop" on your communications and hence be an issue on public WiFi but not via cell. It's a flaw that could allow a hacker to trick your system into visiting and accepting as valid an imposter site that looks like a secure (i.e. HTTPS) web site should the attacker be able in some way to misdirect your connection, such as through a fake email or other fake web site.
 
If you want a more complete explanation without getting too far into the code, see:
 
http://nakedsecurity.sophos.com/2014/02/24/anatomy-of-a-goto-fail-apples-ssl-bug -explained-plus-an-unofficial-patch/"
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If the victim user gets a faked email from citibank (with genuine graphics copied from their site, a fake from), and clicks the link.

It takes the victim to ci1ibank.com (1 not t).

Could the SSL bug be relevant then?

Mike
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Thanks!  I got all my IOS 4.x ipad2 users to upgrade to IOS 7.  (no small task!   exec's don't like change!)
pity you couldn't get budget to buy them newer already-ios-7 iThingies - they would have jumped at that instead of bitching about upgrading software :)
money aside, I really don't want to fuss with them (when everything is working fine) :-)
meh. from experience, toys in the hands of execs are never *less* work, no matter what release they are :)
I nearly lost everything on one exec's ipad (upgrading from ios 4 to ios7).  The trick was after the upgrade, I had to pick 'setup as new ipad' (which I didn't want to do because I thought it would erase everything).  Turns out ios4 was pre icloud, so it totally confused the upgrade.

I guess no apple engineer thought anyone would ever upgrade from something that old?