Icons and pictures of animate objects on mobile phones

Q: In mobile phones there are pictures in menus that we cannot delete, e.g. my contact list has the symbol of the silhouette of a human head. When we use messenger there is an icon with a smiley face displayed all the time. When you click it you can choose images you want to insert. This smiley icon is always displayed on the messenger screen. You cannot get rid of it. Can we still use the messenger, knowing we will use phrases like insha Allah etc. so Allah's Name would be displayed on the same screen as the smiley icon?

Responding to the call of Nabi (Sallallahu Alayhi Wasallam) even if one was engaged in Salaah

Q: A family member recently heard a lecture in which the speaker made a comment that if you do not think of nabi salaalaahu alaihi wa sallam in your namaaz, your namaaz is invalid. The speaker furhter presented a hadith as his proof in which he only mentioned that a sahaabi was performing namaaz when Nabi (Alaihis Salaam) called him and he failed to reply.

Is there any such hadeeth, if yes, what is the complete hadith with the explanation?

Hoors of Jannah

Q: My sister-in-law is a revert. She accepted Islam but because she can't accept that in jannat the males will have many hoors to have relations with so now she feels that this is injustice and she wants to go back to christianity! If mufti sahb can please advise on how to remedy the situation.

Taking care of husbands children

Q: My husband has two daughter from his X-wife. His wife was in adultery and she divorced him and took both girls with her. She got married with other guy and divorced him too. Now she (X wife) send her oldest daughter to my home. She is now 18 years old. My husband is still paying child support for them and will continue paying for the next 5 years, until his younger daughter turns 18. First daughter is also in adultery just like mom.  X wife sent oldest daughter to my home to let her live with me and my husband. She said that she asked some people in mosque that how can she save her younger daughter from her older sister to stay out of this habbit. They told her to send her here to her father. Even she got here but she showed herself just in a week. My hubby and his x wife hid all their daughter's behavior from me. I let her stay in my house, but now my question is, I have two sons too, don't I have to save my kids from her to learn bad things. I don't want her to stay in my home. So I told my hubby to send her back as she is the punishment of her mom
not me. Why should keep her and I am not even comfortable with her, but father doesn't want to send her back as she came to live him after 13 years. Am I doing something wrong. Don't I have right to save my kids? They are just 8 and 6 years old boys. Please let me know what should I do?