13 articles.
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
Research
Mobile number portability in 68 countries: launch dates, porting times and published volumes, with a source per row, plus why prefix carrier lookups fail.
10 min read
Guides
MCC and MNC codes identify every mobile network. How the ITU E.212 system works, how to read a code like 310260, MCC vs calling code, and a list by country.
13 min read
Guides
Free carrier lookup methods (prefix data, regulator tables, web tools), why they fail for ported numbers, and when a paid live lookup is worth it.
10 min read
Deliverability
Email to SMS gateway list for US carriers in 2026: AT&T ended email to text in June 2025, Verizon calls vtext legacy. Status, sources and what to use instead.
9 min read
Deliverability
How to check if a phone number has been ported: MNP lookup, HLR and carrier lookups compared, what each result field means, and a step-by-step API example.
10 min read
Guides
MCC/MNC lookup by phone number: why the prefix shows only the original network, how to get the current code with MNP or HLR, and 5 mistakes to avoid.
8 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
Guides
To check if a phone number is active, validate it, then run a carrier or HLR lookup for live status; app checks show registration. Free methods and limits.
8 min read
Guides
What carrier and line type data is, allocated vs current network, how porting changes it, and how to read every field of a carrier lookup answer.
8 min read
Guides
Validation checks the digits, MNP finds the current network, HLR asks the network if the number is live. What each answers, costs and misses.
7 min read
Guides
A number's prefix shows the network its range was given to, not the one serving it today. How porting works, where lookups fail and how to handle it.
7 min read
Fraud prevention
Why VoIP numbers matter at sign-up, fixed vs non-fixed VoIP, which signals detect them, and how to add friction without turning away real customers.
8 min read
