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 last time I played with a Google Pixel phone was three years ago, with the Google Pixel 3a XL. It has since End of Line (EOL), with the last supported operating system (OS) being Android 12, which was released in 2021. The previous (and last) security patch for Pixel 3a XL was released in September 2022.
Now back to Google Pixel 7 Pro. Google Pixel 7 Pro was officially announced during Made by Google event on 7th October 2022 and was released in Singapore on 14th October 2022. There are three colors available for Pixel 7 Pro, Hazel, Snow, and Obsidian. Snow and Hazel are only available for 128GB, whereas Obsidian is available for 128GB and 256GB.
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+.
Huawei P30 Pro was launched in Singapore back on the 6th April 2019. As of today, there are four colors available for the P30 Pro, Amber Sunrise, Breathing Crystal, Aurora, and Black.
Two storage capacities are available for the P30 Pro, 256 GB, and 512 GB. The 256 GB retails for S$1,398 while the 512 GB retails for S$1,698. You can get both models on the official Huawei store on Lazada.
Google Pixel 3a and Pixel 3a XL was launched in Singapore on 8th May 2019.
Pixel 3a retails for S$659 featuring a 5.6″ display while its larger sibling, the Pixel 3a XL, retails for S$779 featuring a 6″ display.