Possible Causes
The recipient's device is switched off or unavailable.
The device has a weak or no signal.
The number is unable to receive SMS (e.g., it belongs to a landline).
There is a carrier-related issue.
T-Mobile Message blocking (more info below)
T-Mobile has a feature that allows recipients on their network to enable a setting which blocks ANY SMS sent to their mobile number from business-type sender numbers, such as Short Codes, Toll-Free, and 10DLC-Routed Long Codes. This includes OTP codes, appointment notifications, etc. from any sender network. This is not a Textla-specific limitation.
SMS sent to T-Mobile recipients with this feature enabled often returns error 30005 in the SMS logs, indicating the block. This can only be removed by having the recipient contact T-Mobile Support directly to request that setting be turned off. Specifically, the mobile user must call 611 directly from their T-Mobile device experiencing the issue – or if using another device, call 1-800-937-8997 – and request "Shortcode Blocklist" setting to be removed from their account.
Possible Solutions
If the problem persists, follow this checklist:
Is the recipient’s device powered on?
Does the device have sufficient signal? Try restarting it.
Is the device connected to its home carrier’s network? Messages may not be delivered if roaming.
Can the device receive non-Textla SMS messages?
Can it receive messages from another Textla number or a shorter message body?
Can other devices using the same carrier receive your messages?
Is this billed?
Yes, this error is billed by the carriers
Are contacts that return this error marked as “invalid”?
No, contacts that return this error are not marked as “invalid” in your Textla contact list.