Hi Kwb7,
Thank you for using the Apple Support Communities! As noted in the article below:
Apple Watch GPS + Cellular
To cover the LTE and UMTS bands used around the world, there are two separate cellular models for Apple Watch Series 8, Apple Watch SE, and Apple Watch Ultra. They have been optimized for use in the country of purchase, and not all models work in all countries or regions. There is no single model that supports cellular service worldwide.
Apple Watch Ultra Model A2684 does support carriers in India and United Arab Emirates, however. It's suggested to speak with your intended carrier to confirm their network supports the cellular bands used by the Apple Watch:
Check with your carrier to see if your iPhone plan is eligible for Apple Watch cellular service. If you have an enterprise or corporate cellular service plan, check with your company or carrier to see if they support this feature. Prepaid accounts and some older accounts may not be supported.
Hope this helps!
Have a great day.