mosque ethics

As-Salamu `Alaykum. Thank you for your interesting service. What is the Islamic ruling concerning entering the Mosque and performing prayer with one’s cell phone switched on? As soon as people start performing prayer in humility, mobiles start ringing causing distraction and annoyance to people at the Masjid. Please provide an Islamic ruling on this matter. Jazakum Allahu Khayran.

Dear scholars, As-Salamu `alaykum. My dad passed away two years ago and left us (widow, four sons and a daughter) a fortune. Among the assets we've inherited is a decent newly built building. This building consists of a basement and four floors. We've thought to convert part of the un-utilized basement and refurbish it to be a mosque as sadaqa jariyah (perpetual charity) and dedicate the reward to our late dad. However, we overheard that this is inappropriate, as a mosque should not have anything above it; i.e. people living their day-to-day life. My question is: Is it permissible to utilize this basement as a mosque and dedicate the reward to my father? Your prompt reply is highly appreciated, as I plan to fly out as soon as this issue is sorted out. Jazakum Allah khayran.

Respected scholars of Islam, As-Salamu `alaykum. What is the ruling of selling things inside the mosque?

Dear scholars, as-salamu `alay kum. How should Muslims go to the mosque? Should they hurry or should they go calmly?