Welcome to Vodafone Community
I have a Sure Signal (Serial number 42173108723) registered to my account and working well with both my Vodafone number and another.
However, I cannot add a third number, recently ported from Talk Mobile. Trying to do so gives the error 500, 2011.
This issue was first escalated a week or so ago on Live Chat. A very friendly operator suggested it would be resolved in 24 hours, but unfortunately still no solution.
It seems that this is a very common problem and the root cause doesn't seem to be getting addressed.
Thanks for any assistance.
Similar problem here. Seems very common and as usual, Vodofone dont care. Carphone Warehouse advised me to switch to another provider..............