Looking up...
A telephone number assigned to a fixed-line telephone, as opposed to a mobile phone number.
固定電話番号は移動できません。
A landline phone number cannot be moved.
In Japan, landline numbers are often tied to specific locations and cannot be transferred like mobile numbers.
In Japanese, 固定電話番号 refers specifically to landline numbers, while 携帯電話番号 refers to mobile numbers.
Composed of 固定 (fixed), 電話 (telephone), and 番号 (number).
In modern usage, landline numbers are less common due to the prevalence of mobile phones, but they are still used in business and home settings.