United States phone number checks
Check United States (+1) numbers in bulk and find their accounts on North American carriers, iMessage, RCS, WhatsApp and more. Order on the web, through the Telegram bot or by API, and pay per record.
Checks for United States numbers
North American carriers
See checksiMessage
See checksRCS
See checksWhatsApp
See checks
Number format
One number per line with its country code +1, for example +1 202-555-01**. A UTF-8 TXT or CSV file with one column and no header.
Good to know
- The carrier lookup returns the line type, carrier and location; it does not tell whether a number uses any app.
Submission format comparison (Valid vs Common mistakes)
| Format type | Example | System handling |
|---|---|---|
| International format with leading + (Recommended) | +120255501** | Accepted · Included in check |
| Digits-only international format (with country code) | 120255501** | Accepted · Included in check |
| Local trunk prefix 0 or missing country code | 020255501** | Skipped automatically · Not billed |
Start bulk phone number checking & active account filtering
Upload your list and CheckIM strips duplicates and invalid numbers for free, then gives you an instant quote for registration or activity checks.