Pretty solid! Only minor issues I could spot were:
1. Wrong carrier for my mobile - number started out life with a UK MVNO (sainsbury's mobile), I have since ported it to Virgin UK (another MVNO) but Twillio lists the carrier as being EE (which is sort of correct in so much as that's who Virgin resell capacity from).
2. No carrier type info for UK voip numbers - tried two numbers, one from Telappliant and one from Andrews & Arnold, got nulls back each time :(
Re: 1, Sainsbury's Mobile is an MVNO on Vodafone, and Virgin is an MVNO on EE, so strictly speaking that's correct (see my previous answer here about how it's probably getting this info: https://news.ycombinator.com/item?id=9300690)
Re: 2, the data is available from Ofcom - maybe if you ask Twilio nicely they'll load it :)
1. Wrong carrier for my mobile - number started out life with a UK MVNO (sainsbury's mobile), I have since ported it to Virgin UK (another MVNO) but Twillio lists the carrier as being EE (which is sort of correct in so much as that's who Virgin resell capacity from).
2. No carrier type info for UK voip numbers - tried two numbers, one from Telappliant and one from Andrews & Arnold, got nulls back each time :(