i can't find a suitable area to ask the following question.

pardon me if i ask at wrong topic.

owned a 3G phone and apparently found out, when i calling people, my call will end at 6 to 7 seconds after calling. i dont know whether is software problem or hardware.

mine is 3.1.3 and JB...

i found out if i using Edge and didnt turn ON the 3G button, my call guarantee will end at 6 to 7 seconds. But if i turn ON 3G, my call went through without problem.

i tried to find all the website about these problem, some say must turn ON 3G to call. is it so? confused.