Stefan,
I'm having the same problem mentioned in the opening message.
What do you mean by "on the logo - press and hold for 3 sec"? I have tried this (open 3cx app first, press anywhere on the big blue and grey 3cx logo) and it doesn't work.
I also tried the people icon for contacts and I can select the contact and the phone number, I'm getting a prompt to select the phone (call by 3cxphone or call by gsm) and nothing happens after that.
I'm running 2.0.5.
TIA.
Device Info
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Phone Model: HTC One S
Firmware Version: Android 4.0.1, HTC Sense 4.0
Issue Info
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Handset: Phone
Contacts: Google
Connection: WiFi
Server: External