Lost my iPhone "APPS" icon and "Siri" to speak questions, etc. Can they be restored?
They are a part of iOS and as such cannot be removed.
Check all folders and homescreens for the App Store icon, if it still cannot be found, go to Settings > General > Reset > Reset Home Screen Layout.
There is no icon for Siri... it is either on or off.
Settings > General > Siri > ON
Retrieving data ...