Bulk Signal Number Checker: CSV Upload and Result Export Guide
A Signal list is a channel list: which numbers are reachable on Signal, and which belong to another channel. The CSV is where the channel split becomes...
Ethan works on phone-number normalization, E.164 formatting, country-code rules, carrier metadata, and line-type detection. His editorial work turns verification signals into practical workflows for CRM cleaning, SMS preparation, lead review, and bulk data operations.
View full author profile →A Signal list is a channel list: which numbers are reachable on Signal, and which belong to another channel. The CSV is where the channel split becomes visible. Bulk Signal Number Checker is the ZelNum page that supports this job: Signal Number Checker.
Quick answer
Build the CSV with one number per row and a record ID. Run the check and export with the on-Signal status per row. Read the on-Signal rows as the campaign list and the valid-but-not-on-Signal rows as the fallback list.
CSV setup
| Column | Why it is there |
|---|---|
record_id |
Joins the result back to the source. Keep it as text. |
input_number |
The original value, unchanged. |
on_signal |
The channel signal. |
status / reason |
The verdict and why. |
checked_at |
The timestamp that makes re-checks comparable. |
Reading the export
Say a team checks 8,200 numbers. The export comes back 57% on Signal, 29% valid but not on Signal, 10% invalid, 4% unknown. (These figures are illustrative, not a product performance claim.)
The on-Signal slice is the campaign list. The valid-but-not-on-Signal slice is the fallback list. The invalid slice gets repaired or suppressed.
Routing the export
- On Signal → the Signal workflow.
- Valid, not on Signal → another channel.
- Invalid → repair or suppress.
- Unknown → retry.
Mistakes to avoid
- Treating “valid” as “on Signal.” The channel signal is the point of the check.
- Deleting the not-on-Signal rows. They are the fallback list, not waste.
- Treating the export as permanent. Re-check quarterly and before big campaigns.
FAQ
Why is the on-Signal signal the point?
Because the campaign routes on it. Valid-without-on-Signal is a fallback, and the distinction is the whole value of the check.
How often should I re-check?
Quarterly as a baseline, plus a re-check before any big campaign.
Can this export support multi-channel routing?
Yes, and that is a main use. The on-Signal status tells you which channel each row belongs to.
What should I do with unknown rows?
Hold them for retry. Unknown is a queue, not a dead end.
Should I merge duplicates?
No. Leave them in and let the checker report per row.
Related ZelNum pages
- How to Use Signal Number Checker for Bulk List Checks for the step-by-step workflow.
- Signal Number Checker Use Cases for how different teams read the same export.