Drip SMS Campaigns via Zapier

Connect my tools2 min readUpdated 2026-03-14

Drip SMS Campaigns via Zapier

Overview

JustCall and Zapier integration enable you to establish automated drip SMS campaigns -- a sequence of text messages sent to customers with the ability to halt messaging upon customer response.

Example use case: Send messages to customers via Google Forms responses at 1-day, 3-day, and 5-day intervals, automatically stopping if they reply.

Setup Steps

The automation requires four components:

Trigger app (e.g., Google Form) providing customer phone numbers
JustCall action to check for existing text replies
Filter to proceed only if no response exists
JustCall action to send the SMS message

Step 1: Configure Trigger

Select your trigger application based on your use case. The example uses Google Forms as the data source for customer contact information.

Step 2: Check for Text Replies

Configuration Process

Create a new Action and select JustCall as the action app
Choose "Check for Text Replies" from the event dropdown
Sign in to JustCall using your API key and Secret (available in your developer settings)

Fill Required Fields

Customer's number: Merge from the previous trigger step
JustCall number (optional): Specify which number to monitor
Country code (optional): Add if the customer number lacks country code formatting

Testing

After configuration, test the action. The system returns:

exits parameter: false (no response found) or true (response found)
Last message content and timestamp (when response detected)

Step 3: Add Filter

Use "Filter by Zapier" to ensure the workflow continues only when no customer response exists. This prevents sending messages to those who've already replied.

Step 4: Send SMS

Follow the referenced article's instructions for sending text messages through JustCall. Add delays (3-5 days) between message sequences and repeat the filter + action steps before each scheduled send.