How can I get my phone to ring longer?

You can decide after how many seconds your voicemail is activated. Your options are 5, 10, 15, 20, 25 and 30 seconds. A few examples:

• To activate your voicemail after 30 seconds of ringing, enter (*)*61*+32456191933**30# and press 'call';
• To activate your voicemail after 25 seconds of ringing, enter (*)*61*+32456191933**25# and press 'call'; etc.
  
  ( * ) means that you have to enter two asterisks for some devices.
• Is this not clear enough? 

You can also fully manage your voicemail from the My Viking app. More specifically:

• Switch your voicemail on and off

• Set how long it takes for your voicemail to become active