diff --git a/tools_webrtc/mb/mb.py b/tools_webrtc/mb/mb.py
index 485fceb858..8b726bf93b 100755
--- a/tools_webrtc/mb/mb.py
+++ b/tools_webrtc/mb/mb.py
@@ -463,35 +463,18 @@ class MetaBuildWrapper(object):
     return ' '.join(gn_args)
 
   def Lookup(self):
-    vals = self.ReadIOSBotConfig()
-    if not vals:
-      self.ReadConfigFile()
-      config = self.ConfigFromArgs()
-      if config.startswith('//'):
-        if not self.Exists(self.ToAbsPath(config)):
-          raise MBErr('args file "%s" not found' % config)
-        vals = self.DefaultVals()
-        vals['args_file'] = config
-      else:
-        if not config in self.configs:
-          raise MBErr('Config "%s" not found in %s' %
-                      (config, self.args.config_file))
-        vals = self.FlattenConfig(config)
-    return vals
-
-  def ReadIOSBotConfig(self):
-    if not self.args.master or not self.args.builder:
-      return {}
-    path = self.PathJoin(self.src_dir, 'tools_webrtc', 'ios', self.args.master,
-                         self.args.builder.replace(' ', '_') + '.json')
-    if not self.Exists(path):
-      return {}
-
-    contents = json.loads(self.ReadFile(path))
-    gn_args = ' '.join(contents.get('gn_args', []))
-
-    vals = self.DefaultVals()
-    vals['gn_args'] = gn_args
+    self.ReadConfigFile()
+    config = self.ConfigFromArgs()
+    if config.startswith('//'):
+      if not self.Exists(self.ToAbsPath(config)):
+        raise MBErr('args file "%s" not found' % config)
+      vals = self.DefaultVals()
+      vals['args_file'] = config
+    else:
+      if not config in self.configs:
+        raise MBErr('Config "%s" not found in %s' %
+                    (config, self.args.config_file))
+      vals = self.FlattenConfig(config)
     return vals
 
   def ReadConfigFile(self):
diff --git a/tools_webrtc/mb/mb_config.pyl b/tools_webrtc/mb/mb_config.pyl
index 018552b829..98bee376e8 100644
--- a/tools_webrtc/mb/mb_config.pyl
+++ b/tools_webrtc/mb/mb_config.pyl
@@ -20,12 +20,12 @@
   'masters': {
     'client.webrtc': {
       # iOS
-      'iOS32 Debug': 'ios',
-      'iOS32 Release': 'ios',
-      'iOS64 Debug': 'ios',
-      'iOS64 Release': 'ios',
-      'iOS64 Sim Debug (iOS 9.0)': 'ios',
-      'iOS64 Sim Debug (iOS 10.0)': 'ios',
+      'iOS32 Debug': 'ios_debug_bot_arm',
+      'iOS32 Release': 'ios_release_bot_arm',
+      'iOS64 Debug': 'ios_debug_bot_arm64',
+      'iOS64 Release': 'ios_release_bot_arm64',
+      'iOS64 Sim Debug (iOS 9.0)': 'ios_debug_bot_x64',
+      'iOS64 Sim Debug (iOS 10.0)': 'ios_debug_bot_x64',
 
       # Mac
       'Mac64 Debug': 'debug_bot_x64',
@@ -136,24 +136,23 @@
       }
     },
     'internal.client.webrtc': {
-      'iOS64 Debug': 'ios',
-      'iOS64 Perf': 'ios',
-      'iOS64 Release': 'ios',
+      'iOS64 Debug': 'ios_internal_debug_bot_arm64',
+      'iOS64 Perf': 'ios_internal_release_bot_arm64',
+      'iOS64 Release': 'ios_internal_release_bot_arm64',
     },
     'internal.tryserver.webrtc': {
-      'ios_arm64_dbg': 'ios',
-      'ios_arm64_rel': 'ios',
+      'ios_arm64_dbg': 'ios_internal_debug_bot_arm64',
+      'ios_arm64_rel': 'ios_internal_release_bot_arm64',
     },
     'tryserver.webrtc': {
       # iOS
-      'ios_compile_arm_dbg': 'ios',
-      'ios_compile_arm_rel': 'ios',
-      'ios_compile_arm64_dbg': 'ios',
-      'ios_compile_arm64_rel': 'ios',
-      'ios_sim_x86_dbg_ios9': 'ios',
-      'ios_sim_x64_dbg_ios9': 'ios',
-      'ios_sim_x64_dbg_ios10': 'ios',
-      'ios_sim_x64_dbg_ios11': 'ios',
+      'ios_compile_arm_dbg': 'ios_debug_bot_arm',
+      'ios_compile_arm_rel': 'ios_release_bot_arm',
+      'ios_compile_arm64_dbg': 'ios_debug_bot_arm64',
+      'ios_compile_arm64_rel': 'ios_release_bot_arm64',
+      'ios_sim_x64_dbg_ios9': 'ios_debug_bot_x64',
+      'ios_sim_x64_dbg_ios10': 'ios_debug_bot_x64',
+      'ios_sim_x64_dbg_ios11': 'ios_debug_bot_x64',
 
       # Mac
       'mac_compile_dbg': 'debug_bot_x64',
@@ -311,13 +310,6 @@
       'x64', 'no_rtc_tests'
     ],
 
-    # iOS
-    # The 'ios' config is just used for auditing. iOS bots
-    # use the ios recipes and look up their GN arguments via files checked in
-    # under //tools_webrtc/ios/bots. It is an error to actually use one of these
-    # configs to generate the build files.
-    'ios': [ 'error'],
-
     # Windows
     'win_clang_debug_bot_x86': [
       'clang', 'openh264', 'debug_bot', 'x86',
@@ -395,6 +387,29 @@
       'android', 'asan', 'clang', 'release_bot', 'arm'
     ],
 
+    # iOS
+    'ios_debug_bot_arm': [
+      'ios', 'debug_bot', 'arm', 'no_ios_code_signing'
+    ],
+    'ios_release_bot_arm': [
+      'ios', 'release_bot', 'arm', 'no_ios_code_signing'
+    ],
+    'ios_debug_bot_arm64': [
+      'ios', 'debug_bot', 'arm64', 'no_ios_code_signing'
+    ],
+    'ios_release_bot_arm64': [
+      'ios', 'release_bot', 'arm64', 'no_ios_code_signing'
+    ],
+    'ios_internal_debug_bot_arm64': [
+      'ios', 'debug_bot', 'arm64'
+    ],
+    'ios_internal_release_bot_arm64': [
+      'ios', 'release_bot', 'arm64'
+    ],
+    'ios_debug_bot_x64': [
+      'ios', 'debug_bot', 'x64'
+    ],
+
     # More configs
     'bwe_test_logging_x64': [
       'debug_bot', 'x64', 'bwe_test_logging'
@@ -495,6 +510,10 @@
       'gn_args': 'use_goma=true',
     },
 
+    'ios': {
+      'gn_args': 'target_os="ios"',
+    },
+
     'no_goma': {
       'gn_args': 'use_goma=false',
     },
@@ -520,6 +539,10 @@
       'gn_args': 'is_clang=false',
     },
 
+    'no_ios_code_signing': {
+      'gn_args': 'ios_enable_code_signing=false',
+    },
+
     'no_lld': {
       'gn_args': 'use_lld=false',
     },