diff --git a/i18n-lands.js b/i18n-lands.js
index 6039989..72672a9 100644
--- a/i18n-lands.js
+++ b/i18n-lands.js
@@ -2,6 +2,25 @@
 // https://www.iso.org/obp/ui/#search
 
 module.exports = {
+  validatePhone ({ phone } = {}) {
+    try {
+      let [fullphone, itc, callnumber] = /^\+(\d{1,3})-(\d{7,11})$/.exec(phone)
+      switch (itc) {
+        case this.CN.itc:
+          return this.CN.phonenumber.test(callnumber)
+        case this.SG.itc:
+          return this.SG.phonenumber.test(callnumber)
+        case this.US.itc:
+          return this.US.phonenumber.test(callnumber)
+        case this.JP.itc:
+          return this.JP.phonenumber.test(callnumber)
+        default:
+          return true
+      }
+    } catch (err) {
+      return false
+    }
+  },
   AD: {
     domain: 'ad',
     indep: 'Yes',
@@ -881,6 +900,7 @@ module.exports = {
     isod: '156',
     isoName: 'CHINA',
     itc: '86',
+    phonenumber: /^1\d{10}$/,
     legalstatus: '1',
     name: {
       enUS: 'China',
@@ -2125,6 +2145,7 @@ module.exports = {
     isod: '392',
     isoName: 'JAPAN',
     itc: '81',
+    phonenumber: /^\d{10}$/,
     legalstatus: '1',
     name: {
       enUS: 'Japan',
@@ -3749,6 +3770,7 @@ module.exports = {
     isod: '702',
     isoName: 'SINGAPORE',
     itc: '65',
+    phonenumber: /^[89]\d{7}$/,
     legalstatus: '1',
     name: { enUS: 'Singapore', zhCN: '新加坡', zhHK: '新加坡', zhTW: '新加坡' },
     namefull: { enUS: 'the Republic of Singapore', zhCN: '新加坡共和国' },
@@ -4416,6 +4438,7 @@ module.exports = {
     isod: '840',
     isoName: 'UNITED STATES',
     itc: '1',
+    phonenumber: /^\d{10}$/,
     legalstatus: '1',
     name: { enUS: 'United States', zhCN: '美国', zhHK: '美国', zhTW: '美国' },
     namefull: { enUS: 'the United States of America', zhCN: '美利坚合众国' },
diff --git a/i18n-phone.js b/i18n-phone.js
deleted file mode 100644
index c52689a..0000000
--- a/i18n-phone.js
+++ /dev/null
@@ -1,25 +0,0 @@
-module.exports = {
-  CN: /^1\d{10}$/,
-  SG: /^[89]\d{7}$/,
-  US: /^\d{10}$/,
-  JP: /^\d{10}$/,
-  validatePhone ({ phone } = {}) {
-    try {
-      let [fullphone, areacode, callnumber] = /^\+(\d{1,3})-(\d{7,11})$/.exec(phone)
-      switch (areacode) {
-        case this.landSet['CN'].itc:
-          return this.CN.test(callnumber)
-        case this.landSet['SG'].itc:
-          return this.SG.test(callnumber)
-        case this.landSet['US'].itc:
-          return this.US.test(callnumber)
-        case this.landSet['JP'].itc:
-          return this.JP.test(callnumber)
-        default:
-          return true
-      }
-    } catch (err) {
-      return false
-    }
-  },
-}
diff --git a/i18n.js b/i18n.js
index a6fa346..47b6e4d 100644
--- a/i18n.js
+++ b/i18n.js
@@ -3,23 +3,4 @@ module.exports = {
   landSet: require('./i18n-lands.js'),
   currencySet: require('./i18n-currencies.js'),
   cryptocoinSet: require('./i18n-cryptocoins.js'),
-  validatePhone ({ phone } = {}) {
-    try {
-      let [fullphone, areacode, callnumber] = /^\+(\d{1,3})-(\d{7,11})$/.exec(phone)
-      switch (areacode) {
-        case this.landSet['CN'].itc:
-          return /^1\d{10}$/.test(callnumber)
-        case this.landSet['SG'].itc:
-          return /^[89]\d{7}$/.test(callnumber)
-        case this.landSet['US'].itc:
-          return /^\d{10}$/.test(callnumber)
-        case this.landSet['JP'].itc:
-          return /^\d{10}$/.test(callnumber)
-        default:
-          return true
-      }
-    } catch (err) {
-      return false
-    }
-  },
 }