Call failed is one kind of network problem.Showing full network but call not work.When you call to other phone then showing call failed.Now I share how to repair nokia 1280 1616 1800 call failed problem.
i am giving you 2 solution for network ok but call fail solution.
this solution work in nokia 1280,1616,1661 etc handset.
first try to make a jumper for +v(3.8) supply on pa ic .
watch this video for Nokia 1280 call fail problem
second resold cpu