nRF9160 DK problem registering to network

Hello, 

I have recently started an evaluation on nRF9160 DK in the UK.
I tried to run the Serial LTE or AT Client examples but I was not lucky to register to a network. 
Using the NB IoT mode (since the UK has no LTE) I could see a tower (Vodafone) on the LTE Link Monitor and I could get the MNCMCC of the country. 
But the kit never registered and it kept searching (LTE box blinking red and yellow). 
I have used 3 different SIM cards. iBasis which came with the kit , Hologram Global SIM, and a Vodaphone Pay as you go. 
All the 3 SIMs are activated and have credit. 
Is there any one knows if there a coverage problem in the UK ! 
Is this normal ? 

Kindly advice.  

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