The model should return phone, not tel

app/datas/contacts.json

@@ -3,7 +3,7 @@
         "id": "75426",
         "last_name": "ANDERSDOTTER",
         "first_name": "Amelia",
-        "tel": "+322 28 45922",
+        "phone": "+322 28 45922",
         "external_id": "108570",
         "groups": [
             {
@@ -42,7 +42,7 @@
         "id": "1245",
         "last_name": "BLINKEVIČIŪTĖ",
         "first_name": "Vilija",
-        "tel": "+322 28 45435",
+        "phone": "+322 28 45435",
         "external_id": "96681",
         "groups": [
             {
@@ -81,7 +81,7 @@
         "id": "2324",
         "last_name": "ANDRIEU",
         "first_name": "Eric",
-        "tel": "+322 28 45170",
+        "phone": "+322 28 45170",
         "external_id": "113892",
         "groups": [
             {