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 “Compliance”
50 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
Cambodian phone numbers: format, operator prefixes, validation and messaging rules
Cambodia phone number format: +855 and 8- or 9-digit mobiles, TRC prefixes for Cellcard, Smart, Metfone and Seatel, tested code, SIM rules and Telegram checks.
19 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
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
Fraud prevention
Recycled phone numbers: how number providers can check a number before reissuing it
For number providers, MVNOs and virtual-number resellers: quarantine rules by country, the FCC database, and HLR and app-account checks before reissue.
12 min read
Guides
Taiwan phone numbers: format, 09 mobiles, validation and messaging rules
Taiwan phone number format: +886 and 10-digit 09 mobiles, area codes, 0800 and 070 ranges, tested code, porting since 2005 and the anti-fraud SMS rules.
24 min read
Guides
Indonesia phone numbers: format, mobile prefixes, validation and messaging rules
Indonesian numbers: the +62 format, why mobiles have 9 to 12 digits, the 08XX prefixes, tested validation code, no mobile porting, and Komdigi's 2026 SIM registration rules.
11 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
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
Japanese phone numbers: format, 070/080/090 mobiles, validation and messaging rules
Japanese phone number format: +81 and 11-digit 070/080/090 mobiles, 050, 020 and 0120 ranges, tested code, one-stop porting and opt-in SMS rules.
22 min read
Guides
Nigeria phone numbers: format, mobile prefixes, validation and messaging rules
Nigerian numbers: the +234 format, the 070, 080, 081, 090 and 091 mobile prefixes, tested validation code, 48-hour porting, NCC's DND 2442 and NIN-SIM rules.
12 min read
Guides
South Korean phone numbers: format, 010 mobiles, validation and messaging rules
South Korean phone number format: +82 and 11-digit 010 mobiles, area codes, 070 and 1588 numbers, tested code, porting and the ad-label SMS rules.
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
US phone numbers: format, area codes, validation and texting rules
US phone number format: +1 plus 10 digits (NPA-NXX-XXXX), US vs Canada area codes, tested validation code, porting, 10DLC, TCPA and the FCC reassigned database.
18 min read
Guides
Pakistan phone numbers: format, mobile prefixes, validation and messaging rules
Pakistani numbers: the +92 format, which 03XX codes are mobile, tested validation code, porting, PTA's short-code and consent rules, and the 3627 register.
11 min read
Guides
India's 2026 anti-spam rules: what TRAI's new amendment means for senders
What TRAI's TCCCPR Third Amendment of 18 September 2026 changes: AI spam flagging, A2P call declaration, 6-hour header suspension, 7-day inquiry consent, 140/1600/1601.
9 min read
Guides
The TCPA "revoke-all" opt-out rule: what the FCC's 2026 order changes
What the TCPA revoke-all opt-out rule required, why it was delayed to 31 January 2027, how the FCC's September 2026 order (FCC 26-67) replaces it, and an opt-out data model. Not legal advice.
11 min read
Deliverability
10DLC registration explained for developers
How US 10DLC registration works: brands, campaigns, timelines, published fees, throughput, why registered messages still get blocked, and list hygiene.
7 min read
Guides
Thailand phone numbers: format, mobile prefixes, validation and messaging rules
Thailand phone number format: +66 and 10-digit mobiles (06, 08, 09), the 0066 parsing trap, tested code, porting, SIM identity rules and LINE checks.
17 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
Vietnam phone numbers: format, mobile prefixes, validation and messaging rules
Vietnamese mobiles are +84 plus 9 digits (10 with the leading 0) since the 2018 switch from 11 digits. Prefixes, tested code, porting and anti-spam rules.
17 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
Hong Kong phone number format: +852, mobile prefixes, validation and messaging rules
Hong Kong phone number format: +852 and 8 digits, no area codes or trunk 0, which first digits are mobile, tested validation code, porting and SIM rules.
13 min read
Guides
Macau phone number format (+853): how to validate Macau mobile numbers
Macau phone number format: +853 and 8 digits with no area codes, mobiles in the 62, 63, 65, 66 and 68 blocks, tested validation code and the Hong Kong overlap.
13 min read
Guides
TCPA compliance checklist for SMS senders (2026)
A dated TCPA checklist for SMS: consent, opt-out words, 10-day revocation, quiet hours, do-not-call, reassigned numbers and list hygiene. Not legal advice.
9 min read
Guides
Do Not Call registry compliance for outbound calling campaigns
The FTC's 31-day National Do Not Call Registry scrub, the safe-harbor conditions, penalties, and what a carrier or spam-reputation check can and can't do before you dial. Not legal advice.
6 min read
Guides
Phone numbers by country: formats, portability, channels and rules
How phone numbers differ by country: formats and E.164, numbering changes, portability, line types, messaging channels, and a dated tracker of calling and texting rules.
11 min read
Guides
Is a phone number personal data under the GDPR?
When a phone number is personal data under the GDPR, what changes for business numbers, and how lookups and enrichment fit lawful basis, notice and rights.
10 min read
Guides
A privacy checklist for phone and e-mail checks
A practical GDPR-oriented checklist for phone and e-mail checks: purpose, lawful basis, minimisation, retention, objections, rights, DPAs and logging.
9 min read
Guides
The Reassigned Numbers Database (RND), explained
What the FCC Reassigned Numbers Database does, how its yes/no/no-data answers and TCPA safe harbor work, what it costs, and where other checks fit.
8 min read
