Asha 503 voip accounts not registering on 3G & not...

Question

Hi all.
I had some trouble to find the proper Forum area for this issue. I hope this is the right place.
Here is the description of the issue:
    [1]Before inserting any SIM into Asha 503:
    [1.1]Through Wi-Fi, mobile registers and makes voip calls, both using encryption and not using encryption;
    [2]After inserting Operator SIM Card (Vodafone)
    [2.1]Accounts (both using and not using encryption) do not register via 3G (even though the sim card allows that - I use same card in other devices);
    [2.2]WiFi connection doesn't register encrypted accounts any more. Tried removing SIM card and restart phone but looks like the "feature" got permanently damaged
I did also try to reinstall firmware but issues remain (meaning that something is being left there from Operator SIM). Anyhow, I should be able to insert a SIM in the phone, otherwise it is not a phone right?
Further info: Previously I have been testing an Asha 311:
    [1]Registers and calls through 3G and WiFi (both using or not using encryption);
    [2] Has an issue with Encrypted sip accounts- when looses WiFi and comes back to same WiFi network, is not able to re-register (this problem doesn't affect sip accounts which are not encrypted).
    [2.1] This problem is not related to SIM - After reinstaling firmware, the symptoms remain.
NOTE: I quit from trying to solve this problem - that is why I bought the 503 .
If anybody as a clue how to help solving Asha's 503 issue, I would be truly grateful and happy.
Dinis
PS In the past I came accross a problem in Asha 311 that was returning error when some apps were trying to access to internet and the solution was this:
http://developer.nokia.com/Community...ries_40_pho​nes
I am not sure if this would be the same kind of problem occurring now in the Asha 503 (however, Asha503 doesn't seem to have same kind of settings as in Ash 311)

Answer 1

Out of the blue after a few restarts, Asha 503 started to work with no problems when connection is WiFi (both encrypted and not encrypted accounts)*.
When connection is 3G it doesn't work at all (it is the same if account was created via UI or though provisioning).
So, the updated Status is:
Asha 503 - voip over 3G not working
Accounts (both using and not using encryption) do not register via 3G (even though the sim card allows that - I use same card in other devices);
Experienced only once - after testing several times turning on and off WiFi to force 3G, did not register via WiFi any of the accounts - had to restart the device. But this happened only once. Normally there are no issues registering through WiFi.
Asha 311j - issues reregistering encrypted accounts when mobile leaves and comes back to WiFi
Registers and calls through 3G and WiFi (both using or not using encryption);
Has an issue with Encrypted sip accounts- when looses WiFi and comes back to same WiFi network, it is not able to re-register (this problem doesn't affect sip accounts which are not encrypted).
This problem is not related to SIM - After reinstaling firmware, and not inserting SIM card, the symptoms remain.
*the unique difference from this morning was that I had removed and inserted again the SIM card - after I had changed some mobile data settings via provisioning. but in the morning was not working.
If anyone has any idea on how to properly  solve this, would help me loads.
Cheers all