This free Colombian phone number checker shows whether a number is valid.
A Colombian phone number checker tells you whether a number is real, which means it follows Colombia's numbering rules and is assigned. Enter a +57 number above and 1Lookup's free checker returns valid or invalid in seconds, with the line type and country, checked against Colombia's numbering plan.
Pick the country, then enter the number without the country code.
Free & rate-limited. No signup required to try.
- Country code
- +57
- Mobile numbers
- 10 digits after +57, starting 3
- Landlines
- 8 or 10 digits after +57, starting 4 or 6, such as +57 604 XXXXXXX
- Written at home
- 321 1234567
- Written for apps and SMS
- +573211234567
- Dialed from the US
- 011 57 321 1234567
A Colombian mobile number is +57 followed by 10 digits, and the first one is 3.
Written with the country code
- +57Country code
- 3Mobile start
- 21 12345679 more digits
The +57 comes before the number and is dropped when you dial inside Colombia.
A Colombian phone number checker reads a number's format first and then checks it against Colombia's numbering plan.
This is the path one check takes. A number can be written correctly and still not be assigned to anyone, so the format check alone is not the answer.
- You enter the numberType it the way it is written at home, such as 321 1234567, or paste it with +57.
- Its format is checkedEach type of number has its own rules. A mobile needs 10 digits after +57 and starts with 3 at home.
- It is checked against the numbering planNumbers outside the US and Canada are checked against the numbering plan of their country, which for this page is Colombia's.Nothing is sent to the number, so it never rings and its owner is never told.
- You see valid or invalidWith the line type and country in a few seconds, and the carrier or network where one is listed.
A Colombian mobile number has 10 digits after +57 and starts with 3, so any other length is not a valid mobile.
These lengths come from the numbering data for Colombia.
| Number type | Starts with at home | Digits after +57 | Written at home |
|---|---|---|---|
| Mobile | 3 | 10 | 321 1234567 |
| Landline | 4 or 6 | 8 or 10 | (604) 2XXXXXX |
Three common mistakes make a Colombian number fail the check, and each one is quick to fix.
Repeating +57 adds digits.
Write +57 321 1234567 once, with the country code at the front.
Typing too few or too many digits makes a number invalid.
A mobile number has 10 digits after +57. With 9 or 11 it cannot be a valid mobile, so look for a missing or doubled digit.
Leaving the wrong country selected changes how the number is read.
The checker reads a number by the rules of the country selected above, so keep Colombia selected for a +57 number. Paste a number with its + and country code and the country is read from the number itself.
These are the questions people ask most about checking Colombian phone numbers.
How do I check if a Colombian phone number is valid?
Enter the number in the box above with Colombia selected. The free checker returns valid or invalid in seconds, with the line type and country. Type it the way it is written at home, such as 321 1234567, or in full as +57 321 1234567.
How many digits is a Colombian phone number?
A mobile number has 10 digits after +57. A landline has 8 or 10 digits after +57, such as +57 604 XXXXXXX.
What does a Colombian mobile number start with?
Mobile numbers start with 3 at home, which is 3 after +57. The next digit is 0, 1, 2, 3, 5 or 7.
How do I write a Colombian number for an app or an SMS tool?
Use the E.164 form: a plus sign, 57, then the number and no spaces, such as +573211234567.
Does the Colombian phone number checker show the carrier?
It shows the carrier or network where one is listed. Numbers outside the US and Canada are checked against the numbering plan of their country rather than live carrier data, so some come back with no carrier name.
Does valid mean the Colombian number is active?
No. Valid means the number is real, correctly written for Colombia and assigned. Whether a line is switched on and reachable right now is a different question, and the free HLR lookup answers it.
Can I check a whole list of Colombian phone numbers?
Yes. This free tool checks one number at a time. A 7-day free trial opens CSV upload and the API, at 1 credit a number.
Does the person know I checked their number?
No. The check reads records only. No call or text goes to the number, so its owner is never told.
What is the landline area code of Medellín?
The code is 604 for Medellín. From abroad you dial +57 and then the code, so Medellín is +57 604. The area code is part of the digits of a landline number.
You can check numbers from other countries on their own pages.
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These free tools answer the next question about a number.
- The +57 country code pageHow to dial Colombia, the time there now and the landline places.
- HLR lookupCheck whether a mobile number is switched on and reachable right now.
- Line type lookupSee whether a number is a mobile, a landline or VoIP.
- Carrier lookupFind the carrier or network behind a number.
- Phone validator for any countryThe same check with the country picker open to every country.
- Phone validation APIRun the same check from your own software, one request per number.
Sources: Google's libphonenumber numbering data for lengths, mobile starts and landline starts, as of September 24, 2026; the ITU list of country codes.