Q: Is it permissible to read WhatsApp messages in the toilet?
A: One should abstain from using the mobile phone in the toilet, as reading and talking in the toilet are against the Islamic ettiquettes of using the toilet. [ Hashiyatut Thahtaw 54]
Furthermore, these days, Islamic content is also circulated on WhatsApp and social media. By reading messages in the the toilet, there is a possibility that the name of Allah, verses of the Quraan, Ahadith, etc may be exposed in the toilet, which is prohibited.