How do I know if I have an HSPA+ signal on my 4S?

[p3eps]

As per the title really!
Is there an icon that comes up when I have an HSPA signal?
I did read something about AT&T putting a '4G' icon in... but I'm in the UK on O2.
I've had some HTC's in the past and got an 'H' when I was getting an HSDPA signal.

[Beastly L92]

Not that I've seen. I'm in an HSDPA area.

On another note, I hope Apple doesn't let AT&T use them as a medium to blatantly lie. I don't care how fast it is (my personal speed tests show 5.2 Mbps, NOT 14.4), if it ain't LTE, it ain't 4G. Period