Guides
Bulk WhatsApp number check for Indian customer lists (+91)
Check an Indian list for WhatsApp: turn 0, 91, 091 and Hindi-digit cells into +91, keep 6–9 mobiles, get a free estimate, and follow DPDP Act and TRAI rules.
16 min read
Articles tagged “WhatsApp”
37 articles.
Guides
Bulk WhatsApp number check for Nigerian customer lists (+234)
Check a Nigerian list for WhatsApp: turn 080, 081, 070, 090 and 091 numbers into +234, fix 00234 cells, get a free estimate, and follow NCC and NDPA rules.
15 min read
Guides
Bulk WhatsApp number check for Philippine customer lists (+63)
Check a Philippine customer list for WhatsApp and Viber: turn 09XX into +63 9XX, keep the 08 mobile blocks, get a free estimate, follow the Data Privacy Act.
17 min read
Guides
Bulk WhatsApp and Zalo number check for Vietnamese customer lists (+84)
Check a Vietnamese list for WhatsApp and Zalo: convert old 11-digit 01X numbers, turn 09X into +84 9X, get a free estimate and follow the 2026 data law.
17 min read
Guides
Kuwait phone numbers: format, mobile prefixes, validation and SMS rules
Kuwait phone number format: +965 plus 8 digits, mobiles on 41, 5, 6 and 9, tested code for library gaps, porting since 2013 and the new 2025 MNP rules.
21 min read
Guides
Qatar phone numbers: format, mobile prefixes, validation and SMS rules
Qatar phone number format: +974 plus 8 digits, mobiles on 3, 5, 6 and 7, tested validation code, porting since 2013, sender rules and PDPPL consent.
21 min read
Guides
Tanzania phone numbers: format, 06 and 07 prefixes, validation and messaging rules
Tanzania phone number format: +255 and 9-digit 06/07 mobiles, TCRA operator prefixes (Vodacom, Yas, Airtel, Halotel, TTCL), tested code, porting and SMS rules.
20 min read
Guides
Bulk WhatsApp number check for Bangladeshi customer lists (+880)
Check a Bangladeshi customer list for WhatsApp: turn 01X, +88 0 and Bengali-digit cells into +880, dedupe, get a free estimate, and follow the 2026 data law.
13 min read
Guides
Bulk WhatsApp number check for Malaysian customer lists (+60)
Check a Malaysian customer list for WhatsApp: fix 01X, 011 and 60 formats to +60, dedupe, get a free estimate, and follow the PDPA 2010 and its 2024 amendments.
13 min read
Guides
Bulk WhatsApp number check for Mexican customer lists (+52)
Check a Mexican customer list for WhatsApp: drop the old +52 1, set the country, dedupe, plan for the 2026 line registry, and follow the new 2025 LFPDPPP.
14 min read
Guides
Bulk WhatsApp number check for Pakistani customer lists (+92)
Check a Pakistani customer list for WhatsApp: turn 03XX, 92 and 3XX cells into +92, drop dead 03 blocks, get a free estimate, and follow PTA and PECA rules.
14 min read
Guides
Dutch phone number format: +31, 06 mobiles, validation and calling rules
Dutch phone number format: +31 plus 9 digits, 06 mobiles, 0970 M2M numbers, tested validation code, 1-day porting, opt-in sales calls and SMS consent.
19 min read
Research
OTP cost by country: WhatsApp authentication rates, SMS cost drivers and the cost of a wasted code
WhatsApp authentication rates for 44 markets (Meta, October 2026), why SMS OTP prices differ by country, and when a number check costs less than a wasted code.
14 min read
Guides
Polish phone number format: +48, mobile prefixes, validation and messaging rules
Polish phone number format: +48 plus 9 digits, no trunk 0, 13 mobile prefixes, tested validation code, 1-day porting, anti-spoofing law and SMS consent.
19 min read
Guides
Bulk WhatsApp number check for Indonesian customer lists (+62)
Check an Indonesian customer list for WhatsApp: fix 08, 62 and 8 formats to +62, dedupe, get a free estimate, and stay within the PDP Law (UU 27/2022).
13 min read
Guides
How to check if a number is on WhatsApp without saving it as a contact
Three free ways to check if a number is on WhatsApp without adding a contact, what the wa.me 'invalid' message means, and how to format numbers by country.
11 min read
Guides
French phone number format: +33, 06 and 07 mobiles, validation and rules
French phone number format: +33 plus 9 digits, 06/07 mobiles, Arcep prefixes, tested validation code, RIO porting, opt-in sales calls and SMS consent.
24 min read
Guides
India phone number format: +91, mobile prefixes, porting and TRAI rules
India phone number format: +91 plus 10 digits, mobile prefixes 6-9, tested validation code, porting (MNP) rules, DLT sender rules and the 140/1600 series.
18 min read
Guides
Italian phone number format: +39, 3xx mobiles, porting and AGCOM rules
Italian phone number format: +39, 3xx mobiles with 9 or 10 digits, landlines that keep the 0, tested validation code, porting, the RPO and anti-spoofing.
22 min read
Guides
Spanish phone number format: +34, mobile prefixes, validation and calling rules
Spanish phone number format: +34 plus 9 digits, 6/7 mobiles, 8/9 landlines, tested validation code, 1-day porting, 400 numbers for sales calls and SMS rules.
20 min read
Guides
Australian phone numbers: format, 04 mobiles, validation and messaging rules
Australian phone number format: +61, 10-digit 04 mobiles, area codes, tested validation code, porting since 2001 and the SMS Sender ID Register.
17 min read
Guides
Colombia phone numbers: format, mobile prefixes, validation and messaging rules
Colombia phone number format: +57 and 10-digit 3XX mobiles, the 2021 60X landline change, tested code, porting, Ley 2300 contact hours and WhatsApp checks.
19 min read
Guides
Germany phone numbers: format, mobile prefixes, validation and messaging rules
German phone number format: +49, variable-length numbers, 015/016/017 mobile prefixes, tested validation code, porting since 2002 and UWG consent rules.
18 min read
Guides
Kenya phone numbers: format, 07 and 01 prefixes, validation and messaging rules
Kenya phone number format: +254 and 9-digit 07/01 mobiles, the CA's operator prefixes, tested code, 4-hour porting, SIM registration and SMS marketing rules.
19 min read
Guides
Nepal phone numbers: format, mobile prefixes, validation and messaging rules
Nepal phone number format: +977 and 10-digit 9XX mobiles, NTC and Ncell prefixes, tested code, why porting isn't live yet, and NTA's SMS and privacy rules.
18 min read
Guides
Sri Lanka phone numbers: format, mobile prefixes, validation and messaging rules
Sri Lankan mobiles are +94 plus 9 digits starting with 7 (07X at home). Operators by prefix, tested code, porting status, SMS rules and PDPA dates.
14 min read
Guides
Argentina phone numbers: format, the mobile 9 and 15, validation and messaging rules
Argentine numbers: why mobiles are +54 9 at home 0 + area code + 15, area codes of 2 to 4 digits, tested validation code, porting and the No Llame register.
15 min read
Guides
Bangladesh phone numbers: format, mobile prefixes, validation and messaging rules
Bangladeshi mobiles are +880 plus 10 digits starting 1 (01X at home: 011, 013-019). Since porting began in 2018, the prefix no longer proves the network.
13 min read
Guides
Malaysia phone numbers: format, mobile prefixes, validation and messaging rules
Malaysian mobiles are +60 1X plus 7 digits, or +60 11 plus 8, so a fixed 10-digit rule rejects valid 011 numbers. Prefixes, tested code, porting, MCMC rules.
14 min read
Guides
Is it legal to check if a number is on WhatsApp? Consent and data-protection rules for businesses (2026)
Is a WhatsApp number check legal? GDPR, India's DPDP Act, Brazil's LGPD, Malaysia's PDPA and US rules, and why registration is not permission to message.
10 min read
Guides
WhatsApp usernames: what changes, and what doesn't, for checking a number
WhatsApp usernames hide phone numbers from new contacts, but accounts still sit on a number. What changes for businesses, the Cloud API and number checks.
7 min read
Guides
Bulk WhatsApp number check: how to verify a customer list (CSV upload or API)
Check WhatsApp numbers in bulk: prepare a CSV, get a free estimate, cap the cost, run the job in the dashboard or API, and act on each answer.
8 min read
Deliverability
WhatsApp Business API pricing in 2026: per-message rates, the October changes and India's rupee deadline
WhatsApp Business API pricing 2026: Meta charges per delivered template by category and country (OTP $0.0008 to $0.0550). October changes, INR deadline.
11 min read
Guides
Messaging-app registration checks: a guide for every app
What a registration check tells you for WhatsApp, Telegram, Viber, Signal, iMessage, RCS, LINE, Zalo and more: modes, unknowns, billing and consent.
9 min read
Guides
WhatsApp Business account check: what the business flag tells you (and what it doesn't)
To tell if a WhatsApp number is a business account, open its profile (business details, blue check for official accounts) or run a business check in bulk.
8 min read
Deliverability
WhatsApp OTP vs SMS OTP: cost per verified user, with a calculator
WhatsApp OTP pricing in 2026: Meta charges $0.0008 to $0.0550 per delivered authentication message, by country. Rates vs SMS and a cost-per-user calculator.
9 min read
Developers
How to check if a phone number is on WhatsApp with an API
How a WhatsApp registration check works, what registered, not registered and unknown mean, and how to call it responsibly from cURL, Node and Python.
9 min read
