48 articles.
Guides
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 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 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 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
Developers
Fictional phone number ranges that regulators reserve in the UK, US, Canada, Australia, Germany and France, how libphonenumber treats them, and safe OTP tests.
11 min read
Guides
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 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
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
Eight phone validation and lookup APIs compared on public, dated evidence: data fields, price at 10,000 lookups, billing of failed lookups, SDKs and MCP, plus a bake-off script.
12 min read
Guides
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
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 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 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 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
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 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 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 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 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
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 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 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 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
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
Phone validation checks the number; verification proves the user holds it. What each one stops, what they cost, and how to combine them in one flow.
7 min read
Guides
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
Developers
Code to validate Indian mobile numbers: what ^[6-9]\d{9}$ misses, normalising +91, 0 and 0091, and tested JavaScript, Python, PHP and C# functions.
8 min read
Guides
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
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
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
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
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
Chinese mobiles are +86 plus 11 digits starting with 1 (blocks 13-19), no trunk 0; landlines use area codes. Operator blocks, tested code and porting.
11 min read
Guides
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 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
Developers
No. libphonenumber checks numbering-plan metadata, not the network. What isValidNumber proves, what it can't, and how to check if a number is live.
7 min read
Developers
The phone validation ladder: syntax, numbering plan, line type and live checks, with the right library for JavaScript, Python, PHP, Go and Java.
7 min read
Developers
Validate phone numbers in Java and Kotlin with libphonenumber: Maven setup, E.164, a Spring Bean Validation constraint, Android notes and a live lookup.
7 min read
Guides
A non-fixed VoIP number works from anywhere over the internet. What it's used for, how it differs from fixed VoIP, and how to tell if a number is VoIP.
7 min read
Developers
Validate phone numbers in Go with nyaruka/phonenumbers, format E.164, and call a lookup API with context timeouts, rate limiting and 429 back-off.
7 min read
Guides
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
Developers
To validate a phone number in Python, parse it with phonenumbers, check is_valid_number and store E.164. Exact NumberParseException errors, Pydantic and pytest.
9 min read
Developers
The common E.164 regex accepts impossible numbers. Real counterexamples, the shortest valid international numbers, and what to use a regex for instead.
7 min read
Research
We counted 182 phone-metadata releases from 2019 to 2026: a median of 14 days apart, and 223 of 238 regions changed. Why validation goes stale.
8 min read
Developers
How to give an AI agent phone and e-mail checks through the MobileValidate MCP server: tools, example prompts, real tool calls and spend safeguards.
9 min read
Guides
The criteria that matter when you choose a phone-intelligence API: coverage, conclusive rates, unknown billing, latency, freshness, privacy and test mode.
9 min read
Developers
Validate phone numbers in JavaScript with libphonenumber-js: min vs max metadata, E.164, form input, and a live line-type check with runnable Node code.
9 min read
Developers
Validate phone numbers in PHP with libphonenumber-for-php, write a Laravel rule, and add a live line-type check with Guzzle that never breaks the form.
7 min read
