diff --git a/apps/spreadsheeteditor/mobile/app/controller/DocumentHolder.js b/apps/spreadsheeteditor/mobile/app/controller/DocumentHolder.js
index 6651aaaf3..0690b9cf9 100644
--- a/apps/spreadsheeteditor/mobile/app/controller/DocumentHolder.js
+++ b/apps/spreadsheeteditor/mobile/app/controller/DocumentHolder.js
@@ -82,6 +82,7 @@ define([
 
                 this.api.asc_registerCallback('asc_onShowPopMenu',      _.bind(this.onApiShowPopMenu, this));
                 this.api.asc_registerCallback('asc_onHidePopMenu',      _.bind(this.onApiHidePopMenu, this));
+                Common.NotificationCenter.on('api:disconnect',          _.bind(this.onCoAuthoringDisconnect, this));
             },
 
             setMode: function (mode) {
@@ -180,7 +181,7 @@ define([
             },
 
             onApiShowPopMenu: function(posX, posY) {
-                if ( !_isEdit ) return;
+                if ( !_isEdit || this.isDisconnected) return;
 
                 if ($('.popover.settings, .popup.settings, .picker-modal.settings, .modal-in, .actions-modal').length > 0) {
                     return;
@@ -334,6 +335,10 @@ define([
                 return menuItems;
             },
 
+            onCoAuthoringDisconnect: function() {
+                this.isDisconnected = true;
+            },
+
             warnMergeLostData: 'Operation can destroy data in the selected cells.<br>Continue?',
             menuCopy:       'Copy',
             menuCut:        'Cut',
diff --git a/apps/spreadsheeteditor/mobile/app/controller/Main.js b/apps/spreadsheeteditor/mobile/app/controller/Main.js
index aeeae8a11..c5335d8d6 100644
--- a/apps/spreadsheeteditor/mobile/app/controller/Main.js
+++ b/apps/spreadsheeteditor/mobile/app/controller/Main.js
@@ -239,6 +239,7 @@ define([
                 }
 
                 this.api.asc_registerCallback('asc_onGetEditorPermissions', _.bind(this.onEditorPermissions, this));
+                this.api.asc_registerCallback('asc_onLicenseChanged',       _.bind(this.onLicenseChanged, this));
                 this.api.asc_setDocInfo(docInfo);
                 this.api.asc_getEditorPermissions(this.editorConfig.licenseUrl, this.editorConfig.customerId);
 
@@ -534,10 +535,33 @@ define([
                     mode: me.appOptions.isEdit ? 'edit' : 'view'
                 });
 
-                SSE.getController('Toolbar').activateControls();
+                me.applyLicense();
 
+                $('.view-main').on('click', function (e) {
+                    uiApp.closeModal('.document-menu.modal-in');
+                })
+            },
+
+            onLicenseChanged: function(params) {
+                if (this.appOptions.isEditDiagram || this.appOptions.isEditMailMerge) return;
+
+                var licType = params.asc_getLicenseType();
+                if (licType !== undefined && (licType===Asc.c_oLicenseResult.Connections || licType===Asc.c_oLicenseResult.Users) && this.appOptions.canEdit && this.editorConfig.mode !== 'view') {
+                    this._state.licenseWarning = (licType===Asc.c_oLicenseResult.Connections) ? this.warnNoLicense : this.warnNoLicenseUsers;
+                }
+
+                if (this._isDocReady && this._state.licenseWarning)
+                    this.applyLicense();
+            },
+
+            applyLicense: function() {
+                var me = this;
                 if (me._state.licenseWarning) {
-                    value = Common.localStorage.getItem("sse-license-warning");
+                    SSE.getController('Toolbar').activateViewControls();
+                    SSE.getController('Toolbar').deactivateEditControls();
+                    Common.NotificationCenter.trigger('api:disconnect');
+
+                    var value = Common.localStorage.getItem("sse-license-warning");
                     value = (value!==null) ? parseInt(value) : 0;
                     var now = (new Date).getTime();
 
@@ -545,7 +569,7 @@ define([
                         Common.localStorage.setItem("sse-license-warning", now);
                         uiApp.modal({
                             title: me.textNoLicenseTitle,
-                            text : me.warnNoLicense,
+                            text : me._state.licenseWarning,
                             buttons: [
                                 {
                                     text: me.textBuyNow,
@@ -560,14 +584,11 @@ define([
                                         window.open('mailto:sales@onlyoffice.com', "_blank");
                                     }
                                 }
-                            ],
+                            ]
                         });
                     }
-                }
-
-                $('.view-main').on('click', function (e) {
-                    uiApp.closeModal('.document-menu.modal-in');
-                })
+                } else
+                    SSE.getController('Toolbar').activateControls();
             },
 
             onOpenDocument: function(progress) {
@@ -624,8 +645,6 @@ define([
                 me.appOptions.canDownload    = !me.appOptions.nativeApp && (me.permissions.download !== false);
                 me.appOptions.canPrint       = (me.permissions.print !== false);
 
-                me._state.licenseWarning = !(me.appOptions.isEditDiagram || me.appOptions.isEditMailMerge) && (licType===Asc.c_oLicenseResult.Connections) && me.appOptions.canEdit && me.editorConfig.mode !== 'view';
-
                 me.applyModeCommonElements();
                 me.applyModeEditorElements();
 
@@ -1417,7 +1436,8 @@ define([
             txtStyle_Total: 'Total',
             txtStyle_Currency: 'Currency',
             txtStyle_Percent: 'Percent',
-            txtStyle_Comma: 'Comma'
+            txtStyle_Comma: 'Comma',
+            warnNoLicenseUsers: 'You are using an open source version of ONLYOFFICE. The version has limitations for concurrent connections to the document server (20 connections at a time).<br>If you need more please consider purchasing a commercial license.'
         }
     })(), SSE.Controllers.Main || {}))
 });
\ No newline at end of file
diff --git a/apps/spreadsheeteditor/mobile/app/controller/Toolbar.js b/apps/spreadsheeteditor/mobile/app/controller/Toolbar.js
index 5ed1c7c18..53479d170 100644
--- a/apps/spreadsheeteditor/mobile/app/controller/Toolbar.js
+++ b/apps/spreadsheeteditor/mobile/app/controller/Toolbar.js
@@ -86,6 +86,7 @@ define([
                 this.api.asc_registerCallback('asc_onWorkbookLocked', _.bind(this.onApiWorkbookLocked, this));
                 this.api.asc_registerCallback('asc_onWorksheetLocked', _.bind(this.onApiWorksheetLocked, this));
                 this.api.asc_registerCallback('asc_onActiveSheetChanged', _.bind(this.onApiActiveSheetChanged, this));
+                Common.NotificationCenter.on('api:disconnect',      _.bind(this.onCoAuthoringDisconnect, this));
 
                 Common.NotificationCenter.on('sheet:active', this.onApiActiveSheetChanged.bind(this));
             },
@@ -159,6 +160,8 @@ define([
             },
 
             onApiCanRevert: function(which, can) {
+                if (this.isDisconnected) return;
+
                 if (which == 'undo') {
                     $('#toolbar-undo').toggleClass('disabled', !can);
                 } else {
@@ -167,6 +170,8 @@ define([
             },
 
             onApiSelectionChanged: function(info) {
+                if (this.isDisconnected) return;
+
                 if ( !info ) info = this.api.asc_getCellInfo();
                 var islocked = false;
 
@@ -195,6 +200,18 @@ define([
                 $('#toolbar-settings, #toolbar-search, #document-back').removeClass('disabled');
             },
 
+            activateViewControls: function() {
+                $('#toolbar-search, #document-back').removeClass('disabled');
+            },
+
+            deactivateEditControls: function() {
+                $('#toolbar-edit, #toolbar-add, #toolbar-settings').addClass('disabled');
+            },
+
+            onCoAuthoringDisconnect: function() {
+                this.isDisconnected = true;
+            },
+
             dlgLeaveTitleText   : 'You leave the application',
             dlgLeaveMsgText     : 'You have unsaved changes in this document. Click \'Stay on this Page\' to await the autosave of the document. Click \'Leave this Page\' to discard all the unsaved changes.',
             leaveButtonText     : 'Leave this Page',