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 

Wearing a watch that has gold plating

Q: I bought an automatic watch that was stated to be all stainless steel. However, I was looking through the  case back and it appears that the rotor (instrument that winds the watch that makes it work) might be gold plated. I looked online and it does seem like the rotor is made of steel, not solid gold. The rest of the watch components, such as the dial, hands, markers, case, strap, buckle & case back are either made of steel or crystal.  Would it be impermissible to wear such a watch if the rotor (or any other mechanical part on the inside) is gold plated?  If that is the case and I have been wearing that watch for the past 8 months, what needs to be done? Should I sell it or would that also be impermissible?