Do you keep getting the Call Forward icon appearing everytime you switch your iPhone on?
This is the icon:
If you do then following the below should solve it.
Firstly dial 1760 to switch off your voicemail.
Now dial 1750 to switch voicmail back on and use the below divert codes to setup your voicemail to take messages in the following instances (depending on your preference).
Not reachable (For example when the phone is switched off or out of signal/service)
To activate= **62*901#
To cancel= ##62#
To check status= *#62#
Busy (For example when your engaged on another call, or you reject an incoming call)
To activate= **67*901#
To cancel= ##67#
To check status= *#67#
No Reply
To activate= **61*901*11* number of seconds #
The *11* only needs to be entered if you wish to set the length of time the phone rings before diverting to voicemail. The standard ring time is 30 seconds but you can have anything from 5 seconds to 30 seconds (in increments of 5) by using the *11* method.
To cancel
##61#
To check status
*#61#
After doing the above, you can then do the below to stop the Call Forwarding phone icon appearing when the iPhone is switched on.
1: On your iPhone, go into Settings/Phone.
2: Next touch Call Forwarding.
3: Next, switch Call Forwarding on.
4: You will now see "Forward to". Touch this and enter 901 (this is O2's voicemail number).
4a: Once you have done this, touch the left pointing CALL FORWARDING at the top left of the screen.
5: Now switch off Call Forwarding.
You should now not see the Call Forward icon appearing.
I can confirm that I had the Call Forwarding icon appearing everytime I switched my iPhone on, and I managed to get rid of it by doing what I have mentioned above.
Leonard or Toby.
Could you sticky this post so that its going to be easy for people with the same issue to spot this post more easily. Thanks 
@Anonymous wrote:
Just had the same problem on my iPhone 5s 32gb this thread advice fixed the problem of the call forwarding icon appearing when phone is switched on Thank you
Glad the advice is still working
