i want to know which is the trusted website to unlock my iphone 5s?

There are none, as only the carrier your phone is locked to can authorize your phone's official unlocking. Apple is well aware of these sites, & periodically goes through the officially unlocked data base to weed out phones that are not officially unlocked.

You've been warned.

You must call Bell Canada and ask them. But the answer will probably be NO. See: http://www.bell.ca/Mobility

Look on their website or call them. Bell Canada offers official unlocking for the iPhone.

Finch is wrong in his answer.

.

http://support.bell.ca/Mobility/Smartphones_and_mobile_internet/My_mobile_phone_ is_locked#INT=SEARCH

You cannot have what you want. Sometimes our desires and reality come into conflict, and reality usually wins. If Bell said you have to wait 90 days, then you have to wait 90 days. You can try calling them and pleading your case.

If "They" means Bell Mobility in Canada, then just have them do it. Note that even after they approve the unlock it will take several days to actually be unlocked.

If it is some sleazebag website you visited, you are on your own.