In the US it does
I don't think they care about the quality of the signal as much as the safety of the signal.

The company that did the testing submitted this.
https://fjallfoss.fcc.gov/prod/oet/f...ive_or_pdf=pdf
(signal radiation patterns toward bottom)

Lots of interesting stuff here, but I don't know how to link it.
https://fjallfoss.fcc.gov/oetcf/eas/...ericSearch.cfm
On search form enter "apple" in "Applicant Name".
Enter "06/01/2010" to " 06/24/2010" in Grant Date Range.
At the bottom of page click on "start search"
You should have the 12 records for the iPhone4.
Now the click on the "View Forms" or "Display Exhibits" links.

An exercise left to the reader
In particular choose a record that pertains to a cell frequency, click on details link and check out the internal photos. (antenna location)
I hope the FCC site can handle the traffic
Take care