change limit of call duration

[hsra007]

i have sony ericsson k810i, my problem is whenever i call someone i can talk ony 1 hour i.e. 0:59:59.after 1 hour call disconnected automatically. I want to extend call duration limit.
thanks for help.

[rapidroll]

the same problem also happens on my w550i in my country named Bangladesh so i don't think it's your phone's problem. In my country it is the network operator problem.