diff --git a/js/models/conversations.js b/js/models/conversations.js
index 00fdbee59..02b9c8abd 100644
--- a/js/models/conversations.js
+++ b/js/models/conversations.js
@@ -2860,9 +2860,7 @@
      * than just their id.
      */
     initialize() {
-      this._byE164 = Object.create(null);
-      this._byUuid = Object.create(null);
-      this._byGroupId = Object.create(null);
+      this.eraseLookups();
       this.on('idUpdated', (model, idProp, oldValue) => {
         if (oldValue) {
           if (idProp === 'e164') {
@@ -2889,14 +2887,16 @@
 
     reset(...args) {
       Backbone.Collection.prototype.reset.apply(this, args);
-      this._byE164 = Object.create(null);
-      this._byUuid = Object.create(null);
-      this._byGroupId = Object.create(null);
+      this.resetLookups();
     },
 
-    add(...models) {
-      const res = Backbone.Collection.prototype.add.apply(this, models);
-      [].concat(res).forEach(model => {
+    resetLookups() {
+      this.eraseLookups();
+      this.generateLookups(this.models);
+    },
+
+    generateLookups(models) {
+      models.forEach(model => {
         const e164 = model.get('e164');
         if (e164) {
           const existing = this._byE164[e164];
@@ -2922,7 +2922,20 @@
           this._byGroupId[groupId] = model;
         }
       });
-      return res;
+    },
+
+    eraseLookups() {
+      this._byE164 = Object.create(null);
+      this._byUuid = Object.create(null);
+      this._byGroupId = Object.create(null);
+    },
+
+    add(...models) {
+      const result = Backbone.Collection.prototype.add.apply(this, models);
+
+      this.generateLookups(Array.isArray(result) ? result.slice(0) : [result]);
+
+      return result;
     },
 
     /**
diff --git a/ts/ConversationController.ts b/ts/ConversationController.ts
index b8728948c..f2e6e166a 100644
--- a/ts/ConversationController.ts
+++ b/ts/ConversationController.ts
@@ -366,6 +366,7 @@ export class ConversationController {
 
       // Conflict: If e164 match has no UUID, we merge. We prefer the UUID match.
       // Note: no await here, we want to keep this function synchronous
+      convoUuid.updateE164(e164);
       this.combineContacts(convoUuid, convoE164)
         .then(() => {
           // If the old conversation was currently displayed, we load the new one
@@ -537,21 +538,13 @@ export class ConversationController {
       'combineContacts: Eliminate old conversation from ConversationController lookups'
     );
     this._conversations.remove(obsolete);
-    this.regenerateLookups();
+    this._conversations.resetLookups();
 
     window.log.warn('combineContacts: Complete!', {
       obsolete: obsoleteId,
       current: currentId,
     });
   }
-  regenerateLookups() {
-    const models = [...this._conversations.models];
-    this.reset();
-    this._conversations.add(models);
-
-    // We force the initial fetch to be true
-    this._initialFetchComplete = true;
-  }
   /**
    * Given a groupId and optional additional initialization properties,
    * ensures the existence of a group conversation and returns a string