Insert the phone number where the Remote Phone Commands app is installed, insert your password and send the commands to your smartphone.
You can enable call forwarding to any phone number, the predefined one configured into Remote Phone Commands app or you can insert a different one optionally. So you can receive all the call to your forgotten smartphone to any phone.
You can disable call forwarding
You can read any contact from the contacts list of the forgotten phone inserting a keyword or the contact name.
This app requires SMS reading and writing permission because the commands are sent to the forgotten phone by sms.