Phased rollout by country code; starting w/ desktop.stories remote flag

ts/types/PhoneNumber.ts

@@ -3,6 +3,8 @@
 
 import memoizee from 'memoizee';
 import { instance, PhoneNumberFormat } from '../util/libphonenumberInstance';
+import * as log from '../logging/log';
+import * as Errors from './errors';
 
 function _format(
   phoneNumber: string,
@@ -25,6 +27,27 @@ function _format(
   }
 }
 
+export function getCountryCode(
+  phoneNumber: string | undefined
+): number | undefined {
+  try {
+    if (phoneNumber == null) {
+      return undefined;
+    }
+    if (!isValidNumber(phoneNumber)) {
+      return undefined;
+    }
+
+    return instance.parse(phoneNumber).getCountryCode();
+  } catch (error) {
+    const errorText = Errors.toLogFormat(error);
+    log.info(
+      `getCountryCode: Failed to get country code from ${phoneNumber}: ${errorText}`
+    );
+    return undefined;
+  }
+}
+
 export function isValidNumber(
   phoneNumber: string,
   options?: {