Sorry, I think it was a caching plugin interfering.
Thanks.
is it possible to have a minimum size for the phone length?
I use this form to trigger custom php code, i’m not sure if you have the same problem but if so here is my solution: http://eduboris.blogspot.ca/2012/04/contact-form-7-send-contact-to-database.html
if this is not the problem you had, sorry misunderstood.