SMS link DLT checker
Since October 2024, Indian telecom operators block SMS with links that are not whitelisted on DLT. Paste your SMS to catch common problems before you send.
- Paste your SMS to start
We check links, public shorteners, http, the Sender ID format and your template.
This is a helper, not an official DLT check. Operators apply the rules in their own way — confirm with your DLT operator or SMS provider before a big send.
Why SMS links stopped delivering
To fight spam and phishing, TRAI directed telecom operators to block commercial SMS that carry links (URLs), APK download links or OTT links such as WhatsApp or Telegram, unless the link is whitelisted for that sender on the DLT platform. Operators started blocking such messages from 1 October 2024.
What this means for you
- Register the domain or exact link you will send against your header and template on your DLT operator’s portal.
- Avoid free public link shorteners in SMS. They are shared by everyone and usually cannot be whitelisted for just you.
- Send the text exactly as approved. Only the {#var#} parts may change, up to 30 characters each.
- Use https and test with a small batch before sending to your full list.
Rules and how each operator applies them can change. Check with your DLT operator or SMS provider for the current process.
hi4.in SMS links
Coming soonWe are building short links made for DLT: one link format per sender, like hi4.in/YRSHOP/offer, so you can whitelist it once and track clicks per campaign. Bulk CSV and API included.
This is not available yet. Join the beta list and we will email you when it is ready. Delivery always depends on operators, so we will never promise it.
How to check an SMS link for DLT
- Paste the SMS exactly as you will send it.
- Add your 6-character Sender ID and, if you have it, your approved DLT template.
- Fix anything marked red or amber, then whitelist your link on your DLT portal.
Questions
What is URL (CTA) whitelisting?
It means registering the links you send in SMS on the DLT platform, against your Sender ID and template. Operators compare links in each SMS with this list and block the message if the link is not on it.
Can I use free public link shorteners in SMS?
It is risky. Public shorteners are shared by thousands of senders, so they are usually blocked unless your exact link has been whitelisted. A link on your own domain is easier to whitelist.
Can a link be inside a {#var#} variable?
Yes, but the link still has to be whitelisted, and some DLT portals have special variable types for links. Check with your DLT operator.
Does this tool send my SMS or check the DLT portal?
No. It runs in your browser and only looks for common problems. It cannot see what is registered on your DLT account.
Can I use hi4.in links in SMS today?
You can whitelist an exact hi4.in link on your DLT portal. Links with your Sender ID in the address (hi4.in/SENDERID/…) are coming soon — join the beta list above.
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