Merge calls

[Tkd]

Trying to merge a call with two other callers. It always states unable to merge call at the last stage.

[Cleoriff]

@Tkd 

You need to call O2 to activate it if three people are included.

https://community.o2.co.uk/t5/Apple/Merge-Calls/m-p/1107340/highlight/true#M159359 

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