diff --git a/default.go b/default.go
index 840e453..bac8e7e 100644
--- a/default.go
+++ b/default.go
@@ -9,10 +9,16 @@ var (
 	Default = New( rand.NewSource( time.Now().UTC().UnixNano() ) )
 )
 
+// Bool returns an arbitrary bool.
 func Bool() bool {
 	return Default.Bool()
 }
 
+// PhoneNumber returns an arbitrary phone‐number.
+func PhoneNumber() string {
+	return Default.PhoneNumber()
+}
+
 func Runes(a ...interface{}) []rune {
 	return Default.Runes(a...)
 }
diff --git a/arbitrary.go b/t.go
similarity index 100%
rename from arbitrary.go
rename to t.go
diff --git a/bool.go b/t_bool.go
similarity index 100%
rename from bool.go
rename to t_bool.go
diff --git a/bool_test.go b/t_bool_test.go
similarity index 100%
rename from bool_test.go
rename to t_bool_test.go
diff --git a/t_phonenumber.go b/t_phonenumber.go
new file mode 100644
index 0000000..0e11c11
--- /dev/null
+++ b/t_phonenumber.go
@@ -0,0 +1,6 @@
+package arbitrary
+
+// PhoneNumber returns an arbitrary phone‐number.
+func (arb T) PhoneNumber() string {
+	return arb.phonenumber_canada()
+}
diff --git a/t_phonenumber_canada.go b/t_phonenumber_canada.go
new file mode 100644
index 0000000..3bfce4e
--- /dev/null
+++ b/t_phonenumber_canada.go
@@ -0,0 +1,61 @@
+package arbitrary
+
+import (
+	"fmt"
+)
+
+func (arb T) phonenumber_canada() string {
+
+	var areacode string
+	{
+		var areacodes []string = []string{
+			"604",
+			"250",
+			"778",
+			"236",
+			"672",
+		}
+
+		areacode = areacodes[arb.randomness.Intn(len(areacodes))]
+	}
+
+	var localpart1 string
+	{
+		localpart1 = fmt.Sprint(arb.randomness.Intn(1000))
+	}
+
+	var localpart2 string
+	{
+		localpart2 = fmt.Sprint(arb.randomness.Intn(10000))
+	}
+
+	var format string
+	{
+		var formats []string = []string{
+			"%s-%s%s",
+			"%s-%s-%s",
+			"%s %s %s",
+			"%s %s%s",
+			"(%s) %s%s",
+			"(%s)%s%s",
+			"(%s) %s-%s",
+			"(%s)%s-%s",
+			"(%s) %s %s",
+			"(%s)%s %s",
+			"%s/%s-%s",
+			"+1%s%s%s",
+			"+1-%s-%s-%s",
+			"+1 %s %s %s",
+		}
+
+		format = formats[arb.randomness.Intn(len(formats))]
+	}
+
+	var result string
+	{
+		fmt.Sprintf(format, areacode, localpart1, localpart2)
+	}
+
+	return result
+}
+
diff --git a/runes.go b/t_runes.go
similarity index 100%
rename from runes.go
rename to t_runes.go
diff --git a/runes_test.go b/t_runes_test.go
similarity index 100%
rename from runes_test.go
rename to t_runes_test.go
diff --git a/string.go b/t_string.go
similarity index 100%
rename from string.go
rename to t_string.go
diff --git a/string_test.go b/t_string_test.go
similarity index 100%
rename from string_test.go
rename to t_string_test.go