Short answer: It’s best not to take cellphones inside a derasar.

• Maryada (temple etiquette) in both Śvetāmbara and Digambara traditions asks for silence, non‑distraction, and inner focus. Phones disturb this and create pramād (carelessness) and āsrava (karmic influx).
• Many derasars explicitly prohibit phones or photography; always follow the local board’s rule.
• Best practice: leave your phone outside or in the temple locker.
• If you must carry it for safety/emergency, keep it completely switched off or in airplane mode before entering, do not use it, and never take it into the garbhagriha (sanctum). No calls, messages, photos, or recordings.
• During pūjā, pratikraman, or pravachan, the rule is even stricter—no phone on your person.

For simple temple‑etiquette guidance, see: and darshan‑vidhi: