extending number of rings before going to voicemail

[Titchsheba]

My iphone 5s and my husband's iphone 11 each ring 3 times only before going to voicemail.  How can I increase the number of rings before transferring to voicemail?

[jonsie]

Help here @Titchsheba 

Guide:How to Lengthen Ringtime on any O2 Mobile 

[Bambino]

@Titchsheba Also see this: https://community.o2.co.uk/t5/How-to-Guides/All-you-need-to-know-about-O2-Voicemail-901/ba-p/547712

[Cleoriff]

Blimey @jonsie you are on a roll.