My problem is how to power nokia 3310 without battery i.e directly with
dc supply of 3.6V or more.
I know battery connection of nokia
A B C D vbat, 74.5k to gnd for li-ion, 25K to 40k thermistor, gnd
I have done this but phone automatically switch off after welcome
screen is complete.

yes it works with high value capacitor but this also involved high
surge current at startup this can damage regulator having lesser
rating.

I have to use 3300uF capacitor and it works very fine