PBBooking v4.0.3 has been released. This is mostly aimed at fixing some minor bugs that crept in as part of the v4.0 release, but also now includes a plugin for the SMS gateway Twilio.
I'd had some reports from a number of users that SMSGlobal was having problems delivering to some EU based addresses and that despite getting SMSGlobal support involved there was still ongoing delivery problems. I had been thinking of including support for Twilio for a while and this release now does that, hopefully fixing the deliverability problems into the EU.
Sending using Twilio is not quite as straight forward as through SMSGlobal as you will need to signup and verify your sender ids as well as rent a Twilio number in order to send. Be very careful to make sure that you pick a number that has SMS support!!!!
Also please note that Twilio will not allow sending to / from unverified senders on a trial account, and will also not allow alpha numeric sender ids on a trial account.
You can find more information on sending via Twilio and SMSGlobal in the knowledge base:
Please note that both these features are only in the subscriber versions of PBBooking.