I've been trying to get one working with the RUT950 but its constantly denied when trying to connect to a network. Vodafone do block certain IMEI ranges to prevent you using this with mobile phones/3G data dongles but usually that shows up in the app, which doesn't appear to be the issue here. You may also need custom APN settings:
ciot.vodafone.com
user: vodafone
pass: vodafone
it is case sensitive.
Let me know if you have any luck.