Yes. The parental guidance system lets you set a PIN to ensure that other people using your phone, especially children, cannot access unsuitable programmes, for example those which contain strong language or sexual content.
To turn parental guidance on/off, select the Parental Guidance link at the bottom of any BBC iPlayer mobile page and follow the instructions.
Guidance labels show information about any programme which contains content that may not be suitable for all audiences, such as strong language, strobe lighting, or adult themes. Access to programmes with guidance labels will be restricted by the Parental Guidance system.