Hello all,
I’ve just found a document with large number of secret codes for activating Field Test mode on various types of phones.
You can download it from this link:
http://www.wpsantennas.com/pdf/testmode/FieldTestModes.pdf
If your model is not in the list, try codes from same vendor…sometimes it works.
PS I hope you find this info useful and if you do, please give rep because i need it 
HTC Evo is already in the document.
Please check document first if posting for some devices in order not to have duplicate entries.
Thx 
Blackberry engineering screen
http://www.zibri.org/2009/08/hidden-things-are-usually-best.htmlJust follow instructions from the link. It worked on all BB I tried.
Enjoy 
for actual phones you could check http://phoneftd.blogspot.com/
Hi
for Samsung there is no need of typing the complex codes(Tough to remember too)…
just dial *#0011#
Regards
Plannerguy
HTC Evo is already in the document.
Please check document first if posting for some devices in order not to have duplicate entries.
Thx 
Blackberry engineering screen
http://www.zibri.org/2009/08/hidden-things-are-usually-best.htmlJust follow instructions from the link. It worked on all BB I tried.
Enjoy 
for actual phones you could check http://phoneftd.blogspot.com/
Hi
for Samsung there is no need of typing the complex codes(Tough to remember too)…
just dial *#0011#
Regards
Plannerguy