Welcome to Vodafone Community
I'm currently in China, and unable to make or recieve calls or txts, as any action results in a message saying "Not registered to network".
I am unable to log on to my vodafone account online as the security process requires me to recieve a code by txt, which of course in this situation I am unable to do.
Although Live Chat is for use within the UK it has been known to work while abroad. Try that.
Or +44 7836 191 191 from abroad (free from a Vodafone mobile)
Lots of info in > http://www.vodafone.co.uk/explore/costs/travelling
Did you have roaming enabled on your account before leaving the UK.
Also just to note as Vodafone has no direct control of a foreign network they won't be able to guarantee service.
You could try also manually choosing another network.
If Your phone is unlocked to all networks is it possible to use a local sim card.
I did have roaming enabled.
I can't seem to get any online chat help from here.
I'm unable to call that Support number due to not being able to access a network.
All in all, pretty tough time.
As I mentioned Live Chat is primarily for use in the UK but some have found it to work abroad.
Can you use someone else's phone to make the call.
A good tip if abroad is : If possible download the Skype app and add perhaps £3.99 credit to call from that.
The number that is suggested to use is (U.K) 0333 304 0191 or +44 0333 304 191
Can your phone accept any networks sim card ?