Sadly MedImmune (Job location is defined to Cambridge UK) seems to use the HR department from Wilmington Delaware for the phone interviews. That means they have problems to call to European numbers (as stated by others too) which was also the case for my phone interview. I checked if I have a call block or certain privacy settings but none of them were active. I also checked that my phone number had the international prefixes. Maybe there was something else not working, I certainly don't want to blame the HR department but it would be convenient to get a notification that the call failed. For me, it was quite expensive to call to the US just to check what went wrong. At the end that leaves promising candidates behind.