Based on their customer service, I suggest amazon.com.tr .
Based on their recent guaranteed 5 year updates policy, I recommend Samsung. For example this one performs really good and it has a huge battery (life)
https://www.amazon.com.tr/Samsung-SM-M127F-Galaxy-Ak%C4%B1ll%C4%B1-Telefon/dp/B095X33MFC/
You can take the bus "BA22". You can use that application to check public transportation routes. You should be able to use Credit cards to pay.
https://play.google.com/store/apps/details?id=kentkart.mobile.antalyakart
Don't expect them to have music etc after 00:00. It really depends how crowded particular place is. I also suggest using a Taxi from a Taxi stop (ask your hotel). Take his number so he can come, return you back. Also install/run the following https://play.google.com/store/apps/details?id=com.whatsapp the standard im https://play.google.com/store/apps/details?id=tr.gov.saglik.hayatevesigar government covid app Use banks for exchange or better use visa/MasterCard.