I've tried to extend the ringtime on our S8 by using the following code:
**61*101** (number of seconds: 15, 20, 25 or 30) #. However, I get a "Connection problem or invalid MMI code" message. What is the correct code, please?
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That is the correct code. For 30 seconds it is **61*101**30#
**61*101*11*30# should also work
I'm assuming that you have call forwarding turned on on the S8?
The only other suggestion I could make is to give the Mobile Assurance Team a call on 132200.