JustCall Phone Validation Integration
Validate phone data automatically across JustCall, so your team works from clean, verified records.
The 1Lookup JustCall integration validates phone numbers inside JustCall. 1Lookup checks each number's line type, carrier, and live reachability and flags spam-reported numbers, then writes the result back so JustCall only works numbers that can actually connect instead of wasting calls and texts.
Why validate JustCall data with 1Lookup
Voice and SMS workflows in JustCall fail silently on bad numbers: dead dials, undelivered texts, and time lost on VoIP throwaways. 1Lookup validates each number's line type, carrier, and reachability so JustCall only works numbers that can actually connect.
Use validated line type and carrier to route SMS versus voice correctly in JustCall, screen out high-risk and spam-flagged numbers, and prioritise reachable mobile contacts.
What you can do
Phone validation
Confirm a number is real and see its line type (mobile/landline/VoIP) and carrier inside JustCall.
Live HLR reachability
Run a live HLR check so JustCall only works mobile numbers that are active and reachable.
Spam & scam screening
Flag spam-reported and high-risk numbers before JustCall dials or texts them.
Number portability (MNP)
See whether a number has been ported so JustCall routes to the correct carrier.
How to connect 1Lookup to JustCall
Create a 1Lookup account and API key
Sign up for a free 1Lookup account and generate an API key from the dashboard. Free-tier lookups let you test before rolling out.
Add a webhook/HTTP step in JustCall
In your JustCall workflow, add a webhook or HTTP action that calls the 1Lookup API with the phone number.
Parse the response
Map the returned fields (line type, carrier, and reachability) into JustCall.
Act on the result
Use the parsed values in JustCall to route, tag, or suppress records based on validity.
Use cases
Smarter call/SMS routing
Route JustCall traffic by real line type and carrier, sending SMS only to mobile lines and skipping unreachable numbers.
Spam and fraud screening
Flag spam-reported and high-risk numbers before JustCall dials or texts them.
Frequently asked questions
What does 1Lookup validate for JustCall?
1Lookup validates phone numbers for JustCall: validity, line type (mobile/landline/VoIP), carrier, live HLR reachability, spam reputation, and number portability. You choose which fields to store in JustCall.
Do I need to write code to use 1Lookup with JustCall?
Minimal code: a webhook or HTTP step in JustCall calls the 1Lookup API, with light configuration to map the response.
Can I validate records I already have in JustCall?
Yes. Alongside real-time validation, you can run existing JustCall records through 1Lookup batch validation and write the cleaned results back.
How long does setup take?
Setup is quick for most teams. The exact time depends on how many fields you map and whether you validate in real time, in bulk, or both.