Is there any way to edit dialled number?

Somehow you can. If you have called up someone for instance #121 , and you have saved the contact named as A in your contact list. Go to phone app , tap on the contact icon (extreme right towards the name ) , edit and then edit the #.
 
Yes.copy the dialed number by holding and paste it to dialer.
If want to add something before number like 0 or 91 then press 0 then paste your copied number.
 

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