Call Recorder works by creating a conference call between you, the person you want to record, and our recording line, which records the call. To be able to create this conference call, your mobile carrier MUST support 3-way conference calling. Without this, the “merge calls” button will not work and Call Recorder will not be able to record. Simply give your mobile carrier a call and ask them to enable 3-Way Conference Calling on your line. Once enabled, the “merge calls” button will begin working as intended.