We use Twilio to provide SMS messaging to local customers, we have recently started to see a big increase in the number of messages that Twilio reports as delivered but are never actually received by the customer.
I am able to fail/succeed sending to my phone by including a URL in the message ie: if I include a URL no message is received, remove the URL and the message is received successfully. Hence my thought that it is local filtering.
I am hoping that someone can point me in the right direction to try and resolve the issues we are having or re-word the messages to avoid triggering the filtering.
Any suggestions/ideas would be greatly appreciated.