Currently using 12 Pro Max. Merge calls used to work until I upgraded from ios 17 to 18 (now 18.3.2). I have looked around the internet and I am not alone. There are a number of troubleshooting methods that worked for others and I have tried them all except factory reset my iphone. Also rang my carriers (dual sim) and they said this feature comes by default. A really strange problem because my friend has the same phone and ios version but he never lost merge calls.
Wonder if you experienced the same and able to fix this issue?
Wonder if you experienced the same and able to fix this issue?