Paying for an item in instalments

Q: My question is,"I am a young person doing my job. I suffered from crises of income. My company's policy has been changed that each worker should have a smart phone to do whatsapp of any competeter activity in the market. While I don't have that phone and I don't have the payment power to purchase that cell phone on cash. So, I decided to purchase that on installment but some persons are making me tense that it is interest.(Sood). Please guide me is it sood?

Correct spelling of names

Q: We want to know if these names are Islamically correct for our child. Also, the correct way to spell in English as our Arabic is not the best. These are the names:

Nur Addunya or Noor Addunya

Nur AlJannah or Noor Aljannah

Nur AlHayat or Noor Alhayat