Bulk Phone Number Validation for agent
Clean a phone-number list inside your existing agent workflow. Glasser supplies numbering-plan checks and standard formats; a file-capable agent can preserve your contact rows, use country hints and separate records that need review.
| Original input | Valid / possible | E.164 format | Country |
|---|---|---|---|
| +1 202-555-0100 | true / true | +12025550100 | US |
| 020 7946 0958 · GB | true / true | +442079460958 | GB |
| 123 · US | false / false | Unavailable | US |
| 020 7946 0958 · no hint | Needs country hint | Unavailable | Unknown |
| +1 202-555-0100 | true / true | +12025550100 | US |
| 020 7946 0958 · GB | true / true | +442079460958 | GB |
| 123 · US | false / false | Unavailable | US |
| 020 7946 0958 · no hint | Needs country hint | Unavailable | Unknown |
How it works
Clean the phone column in my contact file, use its country column and return normalized values plus records needing review.
StraleYour agent finds the data you need through Glasser.
Why choose Glasser Bulk Phone Number Validation?
Bring number checks
into your contact workflow.
Glasser supplies numbering-plan validation to your existing agent. An agent with file tools can add normalized numbers and validity flags directly to your contact sheet, preserving row IDs, names and your other columns for the next step in your workflow.
Use your country column.
Return a separate review list.
Tell your agent which phone and country columns to use. It can retain original values, flag ambiguous local numbers and separate invalid or unresolved entries from the cleaned records. You get an exception list to fix alongside the standardized output.
set up https://glasser.ai/SKILL.md
Check the phone column using my country hints. Keep original numbers alongside valid, possible and E.164 fields.
Skip completed checks.
Avoid duplicate requests.
Your agent can select unchecked rows and request identical number-and-country combinations once, then map results back to all matching contacts. Each validation is billed separately, including no-result responses under the source’s terms; inspect the price and agree on the list first.
- +1 202-555-0100US · Not checkedCheck once
- +1 202-555-0100US · Same numberReuse result
- +44 20 7946 0958GB · Already checkedKeep result
Frequently asked
questions.
Does valid mean a number is active?
The source checks numbering-plan data and formats. A valid result does not establish active service, SMS delivery, whether anyone answers, or who owns the number.
What do valid and possible mean here?
They are separate flags returned by the source. Keep both original flags in your report rather than treating either as evidence of live reachability.
Do I need country codes?
International format provides the calling code. For local-format numbers, supply an ISO two-letter country hint when needed. Ask your agent to flag ambiguous inputs before checking them.
Can I validate an entire spreadsheet?
An agent that can read your file can select the phone column, check numbers individually and match the results back to each row. Agree on the list size and estimated cost first.
Does this identify the owner or guarantee carrier details?
It does not identify an owner. Carrier information is not guaranteed by this source; the official description notes an empty carrier field in its tests. Leave unavailable fields blank.
Where do I use this tool?
Use it in your AI agent after connecting Glasser. Local agents use the Skill and CLI; ChatGPT and Claude.ai use the connection flow in their setup guides. Describe your request, provide the inputs, and let your agent check the available sources.
How much will a task cost?
Glasser provides paid data on a pay-as-you-go basis. Ask your agent to check the selected endpoint's current price and estimate the scope before running the task. Charges for empty results or failed calls depend on that endpoint's terms.
Return a cleaner contact sheet and a clear review list.
set up https://glasser.ai/SKILL.md