answered
2014-02-13 12:22:17 +0200
Hi, potential reasons for the problem could be related to the device or operator network.
For activating Call waiting on Jolla all that you should need to do is to enable it via Settings > Apps > Phone > Call waiting so that the icon lights up (and no error messages are displayed). Sounds like you have already done this.
1) An alternative way to check the service status using your phone is by sending a command *#43# using the dialler (Enter phone number > *#43# > Call). I recommend you to do this and to check what's the status for "voice" is enabled or disabled.
2) An another way to check is to insert the SIM card to a different manufacturer phone and check how it reports the Call waiting status, and if it works there.
These steps should give you clues if the problem is related to your specific phone or to the operator's network side service. If *#43# reports service as disabled, you may try rebooting and toggling the UI setting again, or enabling it via "calling" using command *43#.
Additional reference: http://en.wikipedia.org/wiki/Call_waiting#Star_codes