Yes, you have the correct T&Cs.
Yes, consumers gave you permission to text them.
But when one of your customers changes their phone number and you send to the old one, that can cause compliance issues.
A: Consider over 500,000 mobile phone numbers change in the US each Day. It just takes a little bit of time before a good portion of your pristine data is corrupted
Subscriber Verify is a SMS data hygiene service (works with all sending platforms and carriers) that tracks all functional mobile numbers and if and when there were changes. They also remove landlines, old, and even suspended numbers that are no longer deliverable. This level of hygiene not only keeps you compliant, but also saves you money. Users typically save between 5~15% on their sending costs when they use www.SubscriberVerify.com.