Windows Phone 7.8 Lumia 710 does not open PHONE/CALL SETTINGS

[gectra]

Hi!
I just found that my WP7.8 Lumia 710 doesn't open in the SETTING/APPLICATIONS the PHONE option. I have no idea what could be the problem. I have the sim inserted well, I have great signal strengh, I can make calls, etc, but that menu doesn't open at all. I tried restarting, changing the inserted SIM, but nothing helped.

Do you have any idea what causes the problem and how could I solve it?

Thank you very much ideed.

 

[Bearach]

Deleted.

 

[gectra]

I updated it with the disconnecting method via Zune. I am not precisely sure about soft-reset, if it's a simple restart, than I have tried it a thousand times.

 

[Bearach]

Deleted.

 

[gectra]

Are you sure that this will solve the problem? (Isn't it possible, that the network provider disabled the menu?) Is it sure that this problem is so serious that I must hard reset the device? How many times is it allowed to use the same activation key on my device?
EDIT
Zune says it has a restore point...Do you think it would help? I think after restoring the device I will need to update it again (

 

[Bearach]

Deleted.

 

[gectra]

Thank you very much indeed for your quick replies. I have just contacted MS Support, now looking for some news from them.

 

[Bearach]

Deleted.

 

[rideboarder]

I just wanted to add that this menu works fine on my lumia 710 with tmobile. I updated via the seven-eighter tool to 7.8.

 

[Bearach]

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[tgp]

I have an unlocked Lumia 710 that I updated by using the Zune/Internet disconnect trick. Phone settings opens fine.

 

[power5]

I had that happen on one of my Titans. I am pretty sure it was on the one I currently have. I did a hard reset after trying to figure out what could be causing the issue, and now that menu works again. I have also just confirmed that it works on my 7.8 updated Titan still.

 

[Bearach]

Deleted.

 

[gectra]

Microsoft Customer Service did actually nothing. If I hard reset my device I will be asked my activation key, won't I? How many times can I use it? Thank you.

 

[Bearach]

Deleted.