This free Tanzanian phone number checker shows whether a number is valid.
A Tanzanian phone number checker tells you whether a number is real, which means it follows Tanzania's numbering rules and is assigned. Enter a +255 number above and 1Lookup's free checker returns valid or invalid in seconds, with the line type and country, checked against Tanzania's numbering plan.
Pick the country, then enter the number without the country code.
Free & rate-limited. No signup required to try.
- Country code
- +255
- Mobile numbers
- 9 digits after +255, or 10 written at home, starting 06 or 07
- Landlines
- 9 digits after +255, starting 02, such as +255Â 22Â XXXÂ XXXX
- Written at home
- 0621 234 567
- Written for apps and SMS
- +255621234567
- Dialed from the US
- 011 255 621 234 567
A Tanzanian mobile number is +255 followed by 9 digits, and the first one is 6 or 7.
Written with the country code
- +255Country code
- 6Mobile start
- 21 234 5678 more digits
Written at home
- 0Replaces +255
- 6Mobile start
- 21 234 5678 more digits
The +255 and the 0 do the same job, so a number is never written with both.
A Tanzanian phone number checker reads a number's format first and then checks it against Tanzania'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 0621 234 567, or paste it with +255.
- Its format is checkedEach type of number has its own rules. A mobile needs 9 digits after +255 and starts with 06 or 07 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 Tanzania'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 Tanzanian mobile number has 9 digits after +255 and starts with 06 or 07, so any other length is not a valid mobile.
These lengths come from the numbering data for Tanzania. A mobile number has 10 digits when it is written at home with its 0.
| Number type | Starts with at home | Digits after +255 | Written at home |
|---|---|---|---|
| Mobile | 06 or 07 | 9 | 0621 234 567 |
| Landline | 02 | 9 | 022 XXX XXXX |
Three common mistakes make a Tanzanian number fail the check, and each one is quick to fix.
Keeping the 0 after +255 adds a digit.
The 0 is only for dialing inside Tanzania, so +255 0621 234 567 is wrong. Drop the 0 and write +255 621 234 567.
Typing too few or too many digits makes a number invalid.
A mobile number has 9 digits after +255. With 8 or 10 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 Tanzania selected for a +255 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 Tanzanian phone numbers.
How do I check if a Tanzanian phone number is valid?
Enter the number in the box above with Tanzania 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 0621 234 567, or in full as +255 621 234 567.
How many digits is a Tanzanian phone number?
A mobile number has 9 digits after +255, or 10 written at home. A landline has 9 digits after +255, such as +255 22 XXX XXXX.
What does a Tanzanian mobile number start with?
Mobile numbers start with 06 or 07 at home, which is 6 or 7 after +255.
How do I write a Tanzanian number for an app or an SMS tool?
Use the E.164 form: a plus sign, 255, then the number without its leading 0 and no spaces, such as +255621234567.
Does the Tanzanian 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 Tanzanian number is active?
No. Valid means the number is real, correctly written for Tanzania 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 Tanzanian 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 are the landline area codes of Dar es Salaam, Zanzibar and Arusha?
At home the codes are 022 for Dar es Salaam, 024 for Zanzibar and 027 for Arusha. From abroad the 0 is dropped, so Dar es Salaam is +255 22. The area code is part of a landline's digits, and a mobile number has none.
You can check numbers from other countries on their own pages.
- +61Australian phone number checkerCheck numbers from Australia
- +1Canadian phone number checkerCheck numbers from Canada
- +44UK phone number checkerCheck numbers from the UK
- +353Irish phone number checkerCheck numbers from Ireland
- +91Indian phone number checkerCheck numbers from India
- +65Singapore phone number checkerCheck numbers from Singapore
- +234Nigerian phone number checkerCheck numbers from Nigeria
- +64New Zealand phone number checkerCheck numbers from New Zealand
- +60Malaysian phone number checkerCheck numbers from Malaysia
- +66Thai phone number checkerCheck numbers from Thailand
- +63Philippine phone number checkerCheck numbers from the Philippines
- +27South African phone number checkerCheck numbers from South Africa
- +254Kenyan phone number checkerCheck numbers from Kenya
- +233Ghanaian phone number checkerCheck numbers from Ghana
- +971UAE phone number checkerCheck numbers from the UAE
- +92Pakistani phone number checkerCheck numbers from Pakistan
- +880Bangladeshi phone number checkerCheck numbers from Bangladesh
- +94Sri Lankan phone number checkerCheck numbers from Sri Lanka
- +852Hong Kong phone number checkerCheck numbers from Hong Kong
- +256Ugandan phone number checkerCheck numbers from Uganda
- +260Zambian phone number checkerCheck numbers from Zambia
- +356Maltese phone number checkerCheck numbers from Malta
- +357Cypriot phone number checkerCheck numbers from Cyprus
- +31Dutch phone number checkerCheck numbers from the Netherlands
- +49German phone number checkerCheck numbers from Germany
- +62Indonesian phone number checkerCheck numbers from Indonesia
- +966Saudi phone number checkerCheck numbers from Saudi Arabia
- +251Ethiopian phone number checkerCheck numbers from Ethiopia
- +962Jordanian phone number checkerCheck numbers from Jordan
These free tools answer the next question about a number.
- The +255 country code pageHow to dial Tanzania, 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.