How to avoid my (Toll Free) SMS number will be blocked or my traffic will be filtered by operators?

- add STOP word to all outgoing SMSs
- use HTTPS instead of HTTP urls
- opt-in: If an audit is initiated by the operators, proof of opt-ins are requested. Collecting the opt-in consent with a MO is the best practice.
- don't use identical content for very large bulk mailings, try to personalize the message content (eg Hi [FIRSTNAME])
- don't Shorten URLs (ie bit.lys)
- no Redirect URL's
- no Rotating toll-free senderID's
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