Articles on: Calls and SMS

How your contacts can opt out of text messages?

You must have done something to upset your recipients. You have likely overwhelmed their inbox with valueless messages or spammed them with adverts. They did this to restrict you from sending more messages to their number.

It's your loss, and you should be careful to avoid further damage. So how do you retain your recipients and ask them to opt-in?

As a sender, you can only request and convince the recipient to opt-in and do nothing more. You can use a second number to do so. However, you cannot force them. It entirely depends on the recipient’s decision.

How opting out works with text messages?

KrispCall operates under legal circumstances and anti-spam legislation. It enables your text recipients (customers) to opt out of your messages. They simply need standard one-word replies to do so.

Note: The one-word replies to opt out vary from one service to another. But are in line with industry benchmarks.

Recipients can use any one of the given STOP replies to stop you from sending them text messages using KrispCall phone numbers:







These replies act as trigger keywords that automate a standard procedure where KrispCall confirms that they no longer will receive messages from the specified phone number.

"You have successfully been unsubscribed. You will not receive any more messages from this number. Reply START to resubscribe."

Important: Only single-word replies can automate this process. “STOP QUIT” or “STOP PLEASE” aren’t the same as “STOP” or “QUIT.” Use only the keywords listed above.

Once a recipient unsubscribes messages from your phone number, you cannot send any messages. All your further tries will be marked as “Failed.”

How contacts can opt back in?

It is a simple procedure and is similar to opting out. Any recipient can opt back to your messages by sending (you) an opt-in keyword to your KripsCall number.

They can reply (back) in the same conversation with either of the following to opt in:




They just need to use one of the above keywords, which triggers the following KrispCall response:

“You have successfully been re-subscribed to messages from this number. Reply “HELP” or “INFO” for help. Reply STOP to unsubscribe. Msg&Data Rates May Apply.”

The “START” keyword enables all your phone numbers associated with your KrispCall account to send messages to the recipient.

Note: KrispCall handles all the above-mentioned messages (keywords) associated with your account and phone numbers, as described earlier. However, we recommend consulting legal counsel to take care of your text messaging campaigns.

Updated on: 17/08/2023

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