People still take selfies with their phone sideways even when there is no mirror for a few reasons. Firstly, the habit of taking selfies in this manner may have originated from the time when front-facing cameras on phones were not yet available, and people had to use mirrors to take selfies. Even though front-facing cameras are now ubiquitous, the habit of taking selfies sideways has persisted. Additionally, some people may find it more comfortable or natural to hold their phone in this position when taking a selfie. Secondly, taking selfies with the phone sideways allows for a wider field of view, which can be useful for including more of the surrounding environment in the photo. Finally, some people may take selfies in this manner simply because they prefer the aesthetic or composition of the resulting image.