my phone froze in middle of updating new soft

Hello there!

That is  how you do a “hard reset”. See below:

Try and Force Restart your iPhone EXACTLY as shown below and see whether that resolves the issue:

• • Press and quickly release Volume UP button
  • Press and quickly release Volume DOWN button
  • Press and Hold the SIDE button until an Apple logo appears and then release the Side button (Can take up to 20 seconds. (DO NOT release Side Button when invited to Slide Power OFF). 

If that doesn’t work

See this video:

How to restart your iPhone if it’s frozen on the Apple logo — Apple Support

Or

Please follow the steps in the following link for support with this issue:

If your iPhone won't turn on or is frozen