Hi
Just go to a Vodafone HighStreet store with ID and they'll do the swap for you.
And it's free.
Or ask Customer Services to post one to you and when received use the sim swap link here
http://m.vodafone.co.uk/mobile/simswap/index.htm to start the process yourself if your a Pay Monthly Customer.
The Sim Swap Online form does not unfortunately work for transferring a Pay As You Go number and Tariff from one Sim Card to another Sim Card.
You would either have to take your Sim Card into a Vodafone HighStreet Store to get the number swapped to a different Sim Card.
Customer Services on 191 or Online Live Chat Help can send you a blank Sim Card of the correct size required, and then when received telephone Customer Services on 191 to request that your mobile number and tariff is transferred to the blank SIM.
To add ensure the iPhone 5s is unlocked or is on the Vodafone network.
It takes from a few minutes normally up to 24 hours rarely to fully settle.
Current Phone >
Samsung Galaxy s²⁵ Ultra 512gb.