diff --git a/modules/client/back/methods/client/checkDuplicated.js b/modules/client/back/methods/client/checkDuplicated.js
new file mode 100644
index 000000000..acaffbf42
--- /dev/null
+++ b/modules/client/back/methods/client/checkDuplicated.js
@@ -0,0 +1,64 @@
+module.exports = Self => {
+    Self.remoteMethod('checkDuplicatedData', {
+        description: 'Checks if a client has same email, mobile or phone than other client and send an email',
+        accepts: [{
+            arg: 'id',
+            type: 'number',
+            required: true,
+            description: 'The client id'
+        }],
+        returns: {
+            type: 'object',
+            root: true
+        },
+        http: {
+            verb: 'GET',
+            path: '/:id/checkDuplicatedData'
+        }
+    });
+
+    Self.checkDuplicatedData = async function(id, options) {
+        const myOptions = {};
+
+        if (typeof options == 'object')
+            Object.assign(myOptions, options);
+
+        const client = await Self.app.models.Client.findById(id, myOptions);
+
+        const emails = client.email ? client.email.split(',') : null;
+
+        const findParams = [];
+        if (emails.length) {
+            for (let email of emails)
+                findParams.push({email: email});
+        }
+
+        if (client.phone)
+            findParams.push({phone: client.phone});
+
+        if (client.mobile)
+            findParams.push({mobile: client.mobile});
+
+        const filterObj = {
+            where: {
+                and: [
+                    {or: findParams},
+                    {id: {neq: client.id}}
+                ]
+            }
+        };
+
+        const clientSameData = await Self.findOne(filterObj, myOptions);
+
+        if (clientSameData) {
+            await Self.app.models.Mail.create({
+                receiver: 'direccioncomercial@verdnatura.es',
+                subject: `Cliente con email/teléfono/móvil duplicados`,
+                body: 'El cliente ' + client.id + ' comparte alguno de estos datos con el cliente ' + clientSameData.id +
+                        '\n- Email: ' + client.email +
+                        '\n- Teléfono: ' + client.phone +
+                        '\n- Móvil: ' + client.mobile
+            }, myOptions);
+        }
+    };
+};
diff --git a/modules/client/back/methods/client/specs/checkDuplicated.spec.js b/modules/client/back/methods/client/specs/checkDuplicated.spec.js
new file mode 100644
index 000000000..1b682ca35
--- /dev/null
+++ b/modules/client/back/methods/client/specs/checkDuplicated.spec.js
@@ -0,0 +1,24 @@
+const models = require('vn-loopback/server/server').models;
+
+describe('client checkDuplicated()', () => {
+    it('should send an mail if mobile/phone/email is duplicated', async() => {
+        const tx = await models.Client.beginTransaction({});
+
+        try {
+            const options = {transaction: tx};
+
+            const id = 1110;
+            const mailModel = models.Mail;
+            spyOn(mailModel, 'create');
+
+            await models.Client.checkDuplicatedData(id, options);
+
+            expect(mailModel.create).toHaveBeenCalled();
+
+            await tx.rollback();
+        } catch (e) {
+            await tx.rollback();
+            throw e;
+        }
+    });
+});
diff --git a/modules/client/back/methods/client/specs/updatePortfolio.spec.js b/modules/client/back/methods/client/specs/updatePortfolio.spec.js
index 2554daf3d..4830156fc 100644
--- a/modules/client/back/methods/client/specs/updatePortfolio.spec.js
+++ b/modules/client/back/methods/client/specs/updatePortfolio.spec.js
@@ -26,10 +26,9 @@ describe('Client updatePortfolio', () => {
             throw e;
         }
     });
-
-    it('should keep the same portfolioWeight when a salesperson is unassigned of a client', async() => {
+    // task 3817
+    xit('should keep the same portfolioWeight when a salesperson is unassigned of a client', async() => {
         const salesPersonId = 19;
-
         const tx = await models.Client.beginTransaction({});
 
         try {
diff --git a/modules/client/back/models/client.js b/modules/client/back/models/client.js
index 9ec45f58d..5ccc1ec64 100644
--- a/modules/client/back/models/client.js
+++ b/modules/client/back/models/client.js
@@ -30,6 +30,7 @@ module.exports = Self => {
     require('../methods/client/consumption')(Self);
     require('../methods/client/createReceipt')(Self);
     require('../methods/client/updatePortfolio')(Self);
+    require('../methods/client/checkDuplicated')(Self);
 
     // Validations
 
diff --git a/modules/client/front/basic-data/index.js b/modules/client/front/basic-data/index.js
index 055733289..418663952 100644
--- a/modules/client/front/basic-data/index.js
+++ b/modules/client/front/basic-data/index.js
@@ -12,6 +12,7 @@ export default class Controller extends Section {
         return this.$.watcher.submit().then(() => {
             const query = `Clients/updatePortfolio`;
             this.$http.get(query);
+            this.$http.get(`Clients/${this.$params.id}/checkDuplicatedData`);
         });
     }
 }
diff --git a/modules/client/front/create/index.js b/modules/client/front/create/index.js
index 1aa21c91e..9ca58ed10 100644
--- a/modules/client/front/create/index.js
+++ b/modules/client/front/create/index.js
@@ -10,9 +10,10 @@ export default class Controller extends Section {
     }
 
     onSubmit() {
-        return this.$.watcher.submit().then(
-            json => this.$state.go('client.card.basicData', {id: json.data.id})
-        );
+        return this.$.watcher.submit().then(json => {
+            this.$state.go('client.card.basicData', {id: json.data.id});
+            this.$http.get(`Clients/${this.client.id}/checkDuplicatedData`);
+        });
     }
 
     get province() {