Do Arabic letters possess a sanctity that prevents placing anything upon them, such as a pen or a phone?

Arabic letters are sacred, so it is not permissible to disrespect them by placing them in an impure place, or by placing something on them in a demeaning way. Some scholars have included non-Arabic letters in this ruling. However, placing something on top of Arabic letters, such as a phone or a pen, is permissible, as it does not involve disrespect.