In Jainism, there is no universal ban on the use of mobile phones or electric lights for all followers. However, certain restrictions exist, especially for Jain monks and nuns (ascetics), and sometimes for lay followers during specific periods or observances. The reasons are rooted in core Jain principles:

1. Ahimsa (Non-violence): Jain monks and nuns avoid using electricity and mobile phones because generating and using electricity can cause harm to tiny living beings (nigodas) present in the air and on devices. The use of electric lights, in particular, is minimized because it may attract and harm insects, leading to inadvertent violence.

2. Aparigraha (Non-possessiveness): Ascetics practice strict non-attachment and renunciation of worldly possessions, which includes modern gadgets like mobile phones. Using such devices is seen as increasing attachment and distraction from spiritual pursuits.

3. Samyama (Self-restraint) and Sanyam (Discipline): Use of mobiles and electric gadgets can disturb concentration, mindfulness, and meditation, which are essential for spiritual progress.

4. Observances during Paryushan and other Festivals: During major Jain festivals like Paryushan, lay followers may voluntarily reduce or avoid the use of mobile phones, television, and electric lights to focus on spiritual activities, self-discipline, and minimizing harm.

5. Monastic Codes: Jain monastic codes (Muni Maryada) prohibit ascetics from using modern conveniences such as phones, vehicles, or electricity, to maintain simplicity, reduce harm, and focus entirely on spiritual upliftment.

In summary: The avoidance or ban on mobile and light use in Jainism, especially among ascetics, is to uphold the principles of non-violence, non-attachment, self-restraint, and focus on spiritual practice. For laypersons, it is more about voluntary restraint during certain observances rather than a strict religious ban.