Hello! The dual SIM version of the M8 does not have the possiblity to set up a SIP account with the native client of Android 4.4 (in contrast to the single SIM version). Thus I have installed the "SIP Switch Widget" from Google play store. This allows me to set up the SIP account and choose the method of dialing (asking before each call if I would like the mobile account or VOIP). Nevertheless if I choose IP-call the call is made through the mobile network. I guess that the phone app has been modified by HTC. The behaviour of incoming VOIP calls is as follows: The phone rings but I am unable to answer the call. Has anyone a fix for it or would develop a solution that the native Android client works? I would certainly pay for it because the native client drains less battery than 3rd party apps. Thanks a lot!
I am having the exact same issue. Just bought the M8 Dual Sim version and was quite disappointed not being able to use the native VoiP client on the phone.
Did you make any progress solving this issue?
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