on 03-04-2020 14:18
on 03-04-2020 14:21
03-04-2020 14:22 - edited 03-04-2020 14:24
03-04-2020 14:22 - edited 03-04-2020 14:24
@MINJUNPARK Ask the person you're trying to call if they have accidentally blocked your number. Alternatively, if you both have WhatsApp you can try calling with that.
Edit: You can also video chat with Facebook Messenger or Skype:
https://community.o2.co.uk/t5/Off-Topic/A-Guide-To-Skype/m-p/1305104/highlight/true#M181823
on 03-04-2020 14:29