diff --git a/lib/index.js b/lib/index.js
index d49b0bb..70a8123 100644
--- a/lib/index.js
+++ b/lib/index.js
@@ -497,9 +497,9 @@ function wb(a){var b=a.o.toString(),c=new RegExp("^(?:\\+|"+w(a.g,11)+")");c=b.m
 function Bb(a,b){var c=a.m.toString();if(0<=c.substring(a.u).search(a.ha)){var d=c.search(a.ha);b=c.replace(a.ha,b);r(a.m);a.m.a(b);a.u=d;return b.substring(0,a.u+1)}1==a.f.length&&(a.l=!1);a.$="";return a.j.toString()};var W=L.b();function Fb(a){var b=W,c=hb(b,a);b=T(b,A(a,1),c);null==b?a=-1:(a=S(a),a=fb(a,b));switch(a){case 0:return"fixed-line";case 2:return"fixed-line-or-mobile";case 1:return"mobile";case 8:return"pager";case 7:return"personal-number";case 4:return"premium-rate";case 5:return"shared-cost";case 3:return"toll-free";case 9:return"uan";case 6:return"voip";default:case -1:return"unknown"}}
 function Gb(a){switch(a){case "fixed-line":return 0;case "fixed-line-or-mobile":return 2;case "mobile":return 1;case "pager":return 8;case "personal-number":return 7;case "premium-rate":return 4;case "shared-cost":return 5;case "toll-free":return 3;case "uan":return 9;case "voip":return 6;default:case "unknown":return-1}}
 function Hb(a){try{switch(jb(a)){case 0:return"is-possible";case 1:return"invalid-country-code";case 3:return"too-long";case 2:return"too-short"}if(ib(a))return"is-possible"}catch(b){}return"unknown"}function Ib(a){if("+"!==a.charAt(0))return{parsed:b,v:c};try{var b=eb(W,a,void 0)}catch(e){}if(b){var c=hb(W,b);if(null!=c&&"ZZ"!==c)return{parsed:b,v:c}}for(var d=1;4>d;++d){c=void 0;if(a.length<d+1)return{parsed:b,v:c};c=U(a.substring(1,d+1));if("ZZ"!==c)return{v:c}}return{parsed:b,v:void 0}}
-function Y(a,b){if(!(this instanceof Y))return new Y(a,b);if("string"===typeof a)var c=!1;else try{gb(a),c=!0}catch(f){c=!1}if(!c&&"string"!==typeof a)throw Error("Invalid phone number, expected a string");if(!c&&null!=b&&"string"!==typeof b)throw Error("Invalid region code, expected a string");if(!c){if(b&&"+"===a.charAt(0)){var d=Jb(b);a.substr(1,(""+d).length)!==""+d&&(b=null)}if(!b){var e=Ib(a);b=void 0===e.v?null:e.v;e=e.parsed}}this.a={number:{},regionCode:b,valid:!1,possible:!1};if(c)this.b=
-a;else{this.b=null;this.a.number.input=a;if(b){if(d=Jb(b),0===d){this.a.possibility="invalid-country-code";return}}else{this.a.possibility="invalid-country-code";return}try{e?this.b=e:this.b=eb(W,a,b)}catch(f){this.a.possibility=Hb(a);return}}this.a.number.international=R(W,this.b,1);this.a.number.national=R(W,this.b,2);this.a.number.e164=R(W,this.b,0);this.a.number.rfc3966=R(W,this.b,3);this.a.number.significant=S(this.b);a=this.a;b=this.b;c=W;c=V(c,hb(c,b));null==c?b=!0:(b=S(b),b=!X(b,w(c,24)));
-a.canBeInternationallyDialled=b;this.a.possible=ib(this.b);this.a.valid=gb(this.b);this.a.type=Fb(this.b);this.a.possibility=Hb(this.b)}function Jb(a){return P(a)?bb(W,a):0}h=Y.prototype;h.toJSON=function(){return this.a};h.ka=function(){return this.a.canBeInternationallyDialled};h.va=function(){return this.a.valid};h.ua=function(){return this.a.possible};h.ra=function(){return this.a.type};h.ta=function(){return"mobile"===this.a.type||"fixed-line-or-mobile"===this.a.type};
+function Y(a,b){if(!(this instanceof Y))return new Y(a,b);if("string"===typeof a)var c=!1;else try{gb(a),c=!0}catch(e){c=!1}if(!c&&"string"!==typeof a)throw Error("Invalid phone number, expected a string");if(!c&&null!=b&&"string"!==typeof b)throw Error("Invalid region code, expected a string");if(!c&&(a=a.trim(),b&&"+"===a.charAt(0)&&(b=null),!b)){var d=Ib(a);b=void 0===d.v?null:d.v;d=d.parsed}this.a={number:{},regionCode:b,valid:!1,possible:!1};if(c)this.b=a;else{this.b=null;this.a.number.input=
+a;if(!b){this.a.possibility="invalid-country-code";return}if(0===Jb(b)){this.a.possibility="invalid-country-code";return}try{d?this.b=d:this.b=eb(W,a,b)}catch(e){this.a.possibility=Hb(a);return}}this.a.number.international=R(W,this.b,1);this.a.number.national=R(W,this.b,2);this.a.number.e164=R(W,this.b,0);this.a.number.rfc3966=R(W,this.b,3);this.a.number.significant=S(this.b);a=this.a;b=this.b;c=W;c=V(c,hb(c,b));null==c?b=!0:(b=S(b),b=!X(b,w(c,24)));a.canBeInternationallyDialled=b;this.a.possible=
+ib(this.b);this.a.valid=gb(this.b);this.a.type=Fb(this.b);this.a.possibility=Hb(this.b)}function Jb(a){return P(a)?bb(W,a):0}h=Y.prototype;h.toJSON=function(){return this.a};h.ka=function(){return this.a.canBeInternationallyDialled};h.va=function(){return this.a.valid};h.ua=function(){return this.a.possible};h.ra=function(){return this.a.type};h.ta=function(){return"mobile"===this.a.type||"fixed-line-or-mobile"===this.a.type};
 h.sa=function(){return"fixed-line"===this.a.type||"fixed-line-or-mobile"===this.a.type};h.na=function(a){return this.a.number[null==a?"e164":a]};h.oa=function(a){return ab(this.b,a)};h.qa=function(){return this.a.regionCode};h.la=function(){return Jb(this.a.regionCode)};function Z(a){this.g=a;this.f=new ob(a);this.a=this.b=""}h=Z.prototype;h.ja=function(a){this.b+=a;var b=this.f;b.ca=vb(b,a);return this.a=b.ca};h.wa=function(){return this.a};
 h.xa=function(){return""===this.b?this.a:this.ia(this.b.slice(0,this.b.length-1))};h.ia=function(a){var b=this.f;b.ca="";r(b.j);r(b.o);r(b.m);b.u=0;b.$="";r(b.b);b.i="";r(b.a);b.l=!0;b.ea=!1;b.s=!1;b.aa=!1;b.f=[];b.ba=!1;b.g!=b.ma&&(b.g=pb(b,b.da));this.b="";if(a){b=0;for(var c=a.length;b<c;++b)this.ja(a.charAt(b))}return this.a};h.pa=function(){return new Y(this.a,this.g)};aa="undefined"!==typeof exports?exports:"undefined"!==typeof self?self:window;m("PhoneNumber",Y);
 m("PhoneNumber.getCountryCodeForRegionCode",Jb);m("PhoneNumber.getRegionCodeForCountryCode",function(a){return U(a)});m("PhoneNumber.getSupportedRegionCodes",function(){return Ta()});m("PhoneNumber.getSupportedCallingCodes",function(){return Va()});m("PhoneNumber.getExample",function(a,b){b=b?cb(a,Gb(b)):cb(a,0);return new Y(b,a)});m("PhoneNumber.getAsYouType",function(a){return new Z(a)});m("PhoneNumber.prototype.toJSON",Y.prototype.toJSON);m("PhoneNumber.prototype.canBeInternationallyDialled",Y.prototype.ka);
diff --git a/src/index.js b/src/index.js
index 8029989..1c89cc4 100644
--- a/src/index.js
+++ b/src/index.js
@@ -143,14 +143,12 @@ function PhoneNumber( phoneNumber, regionCode )
 
 	if ( !isInternal )
 	{
+		phoneNumber = phoneNumber.trim( );
+
 		if ( regionCode && ( phoneNumber.charAt( 0 ) === '+' ) )
-		{
-			// Ensure region code is valid
-			var cc = PhoneNumber.getCountryCodeForRegionCode( regionCode );
-			if ( phoneNumber.substr( 1, ( '' + cc ).length ) !== '' + cc )
-				// Wrong region code, let's fix it
-				regionCode = null;
-		}
+			// Ignore region code if we have an international phonenumber,
+			// it'll be extracted properly by libphonenumber.
+			regionCode = null;
 
 		if ( !regionCode )
 			// Guess region code
diff --git a/test.in/awesome-phonenumber/should-compile.ts b/test.in/awesome-phonenumber/should-compile.ts
index 836bcdd..e5ef4bf 100644
--- a/test.in/awesome-phonenumber/should-compile.ts
+++ b/test.in/awesome-phonenumber/should-compile.ts
@@ -115,6 +115,12 @@ describe( 'general', function( ) {
 		expect( pn.getRegionCode( ) ).to.equal( 'CA' );
 	} );
 
+	it( 'should not use US for known CA numbers', function( ) {
+		// Issue #51
+		const pn = new PhoneNumber( '+1613 734.6759', 'US' );
+		expect( pn.getRegionCode( ) ).to.equal( 'CA' );
+	} );
+
 	it( 'should extract region by prefix as early as possible', function( ) {
 		const pn1 = new PhoneNumber( '+1' );
 		const pn1x = new PhoneNumber( '+12' );