Sry dont know how to fix your problem but just some information to Vertu rep buyers.
This phone will not work properly in every country.
I have phone ca 3 month ( was my girlfriend phone but for her this phone was to heavy).
Works without problems, menu is quite slow but it is not good phone if you are traveling a lot.
Month ago I was in France ( Nice) and in Monaco , it has a signal but was not possible to call or receive call`s. Was possible to call if manually change to other net provider. If I remember correctly then problem was with Orange network.
Yesterday I was in Finland. Was not possible to call also- invalid SIM car was error message on screen. Was even not possible to change network providers
Back home no such problems with call`s. In my country it works perfectly.
But this rep Vertu cell phone is not suitable for traveling.