A number of Samsung smartphones are sending out users' pictures to their contacts without their permission, according to various complaints online.

And users are finding no record of the exchange on their phone's messaging app.

The smartphone manufacturer says they are investigating the complaint, primarily linked to Samsung's Galaxy phones. The texts appear to send random photos to contacts in the phone's user contacts without any record of the message.

The first reports of this surfaced online in Reddit and Samsung users posts. Samsung acknowledged the problem Tuesday but said they are considering the events to be isolated incidents.

Online threads on Samsung's official forums suggests it may be connected to a messaging update on T-Mobile-supported devices.

One way to prevent this happening on your phone is to revoke permissions to your messaging app so it no longer has access to data (photos) on your phone, or use a third-party text messaging app such as WhatsApp or Android Messages.