As my knowledge cutoff is in September 2021, I don't have information about specific smartphone models released in 2023. However, I can provide you with some general tips to consider when looking for a smartphone under 15000 in 2023:

1. Research Latest Smartphone Models: Stay updated with the latest smartphone releases in 2023 within your budget range. Check reputable technology websites, reviews, and smartphone news sources to gather information about the best smartphones available at that time.

2. Consider Mid-Range Brands: Mid-range smartphone brands often offer a good balance between features and price. Look for brands such as Xiaomi, Realme, Samsung, Motorola, or Nokia, as they frequently offer competitive smartphones within the 15000 price range .

3. Identify Key Features: Determine the features that are important to you, such as camera quality, display size and resolution, battery capacity, performance, and storage. Prioritize your requirements and find a smartphone that offers the best combination of features within your budget .

4. Compare Specifications: Compare the specifications of different smartphone models, including processor, RAM, storage capacity, camera resolution, battery capacity, and display quality. This will help you assess which phone offers the best value for your budget.

5. Read User Reviews: User reviews provide valuable insights into the real-world performance and user experience of smartphones. Look for reviews from verified buyers and consider factors like build quality, software experience, camera performance, and battery life.

6. Consider After-Sales Support: Check the after-sales support and warranty policies offered by the smartphone brand. A reliable after-sales service network and warranty coverage can provide peace of mind if you encounter any issues with the device.

7. Visit Physical Stores: If possible, visit physical stores to get a hands-on experience with different smartphone models.

8. Set Realistic Expectations: Keep in mind that smartphones under 15000 may not offer all the high-end features found in flagship devices. However, you can still find smartphones with impressive performance, decent cameras, good battery life, and a satisfactory user experience within this price range.

It's important to note that smartphone availability, specifications, and pricing can vary over time. To find the best smartphone under 15000 in 2023, it's recommended to research the latest models, compare specifications, read user reviews, and consider the specific features that matter most to you.