All models of iPhone 15 will be launching on Friday, 22nd September 2023.
With regards to 5G/LTE networks in Singapore, we are getting the following models:

The Samsung Galaxy Note10 and Note10+ will be launching in Singapore on Saturday, 24th August 2019.
For the first time, there is an additional Note model available, which is the plus model, Note10+.
The iPhone XR will be launching on Friday, 26th October 2018.
With regards to LTE networks in Singapore, for the iPhone XR model, we are getting the A2105.
The Pixel 3 and Pixel 3 XL will be launching on Thursday, 1st November 2018.
The Pixel 3/3 XL will be available in three colors, Clearly White (White), Just Black (Black), and Not Pink (Pink). For each color and model, it is available in either 64GB or 128GB.