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+## Inderstanding phone numbers
+
+    http://whitepages.fr/phonesystem/
+    https://support.twilio.com/hc/en-us/articles/223183008-Formatting-International-Phone-Numbers
+    https://en.wikipedia.org/wiki/National_conventions_for_writing_telephone_numbers
+
+## Open data
+
+    https://api.ovh.com/console/#/telephony
+    https://countrycode.org/
+    http://www.countryareacode.net/en/
+    http://directory.didww.com/area-prefixes
+    http://hs3x.com/
+    http://www.numinfo.net/
+
+## Reputation / fraud
+
+    scamcallfighters.com
+    signal-arnaques.com
+    
+## Disposable numbers
+
+    receive-sms-online.com
+    receive-sms-now.com
+    hs3x.com
+    twilio.com
+    freesmsverification.com
+    freeonlinephone.org
+    sms-receive.net
+    smsreceivefree.com
+    receive-a-sms.com
+    receivefreesms.com
+    freephonenum.com
+    receive-smss.com
+    receivetxt.com
+    temp-mails.com
+    receive-sms.com
+    receivesmsonline.net
+    receivefreesms.com
+    sms-receive.net
+    pinger.com (=> textnow.com)
+    receive-a-sms.com
+    k7.net
+    kall8.com
+    faxaway.com
+    receivesmsonline.com
+    receive-sms-online.info
+    sellaite.com
+    getfreesmsnumber.com
+    smsreceiving.com
+    smstibo.com
+    catchsms.com
+    freesmscode.com
+    smsreceiveonline.com
+    smslisten.com
+    sms.sellaite.com
+    
+## Individuals
+
+    Facebook
+    True People
+    Fast People
+    Background Check
+    Pipl
+    Spytox
+    Makelia
+    IvyCall
+    PhoneSearch
+    411
+    USPhone
+    WP Plus
+    Thats Them
+    True Caller
+    Sync.me
+    WhoCallsMe
+    ZabaSearch
+    DexKnows
+    WeLeakInfo
+    OK Caller
+    SearchBug
+    numinfo.net
+    
+## Google dork examples
+
+    `insubject:"+XXXXXXXXX" | insubject:"+XXXXX" | insubject:"XXXXX XXX XXX`
+    `insubject:"{number}" | intitle:"{number}"`
+    `intext:"{number}" ext:doc | ext:docx | ext:odt | ext:pdf | ext:rtf | ext:sxw | ext:psw | ext:ppt | ext:pptx | ext:pps | ext:csv | ext:txt | ext:html`
+    voip provider check: `site:"hs3x.com" intext:"+61437954897"`
+    scam number check:`site:signal-arnaques.com intext:"0682649478" intitle:" | Phone Fraud"`