While local cab and taxi booking companies in India offer offline booking options, mobile apps have become a convenient and popular way to book cabs and taxis. Here are some of the best mobile apps with excellent support:
Nationwide Apps:

Ola: A popular app with a large fleet of cabs and diverse vehicle options. Offers competitive rates, 24/7 customer support, and features like live tracking and ride sharing.
Uber: Another well-known app offering a wide range of vehicles, including budget-friendly options like UberGo and luxurious options like UberBlack. Provides reliable service, live tracking, and 24/7 customer support.
Meru Cabs: A trusted app with a focus on safety and reliability. Offers airport transfers, outstation packages, and corporate travel solutions. Provides 24/7 customer support and online booking options.
Fast Track Cabs: Offers a user-friendly app with various features like ride booking, fare estimation, and live tracking. Provides reliable service in major cities and airport transfers.
Regional Apps:

Mega Cabs (Delhi, NCR, Jaipur): Offers competitive rates and reliable service within Delhi, NCR, and Jaipur. Features online booking and 24/7 customer support.
Yatri Cabs (Chandigarh, Mohali, Panchkula): Provides affordable and reliable taxi services within the Tricity area. Offers in-app booking and responsive customer support.
Kuber Travels (Bangalore, Chennai, Hyderabad, Kochi): Offers a diverse fleet of vehicles and personalized services. Features online booking, tour packages, and 24/7 customer support.
Nandan Cabs (Bangalore): Renowned for its excellent customer service and affordable rates. Provides a user-friendly app with online booking and real-time tracking.
City Taxi (Chennai): Offers convenient and reliable taxi services within Chennai and to nearby destinations. Features online booking and provides responsive customer support.
Features to Consider:

Network Coverage: Ensure the app provides services in your desired location.
Vehicle Options: Choose an app offering a range of vehicles to suit your needs and budget.
Fare Transparency: Look for apps with transparent fare estimates and upfront pricing.
Booking Features: Consider apps with user-friendly interface, online booking options, and ride tracking tools.
Customer Support: Choose an app with responsive and helpful customer support available 24/7.
Additional Notes:
Many local cab and taxi companies are developing their own mobile apps for direct booking and enhanced customer experience.
Consider using a combination of online and offline options based on your convenience and location.
Always check ratings and reviews before booking a cab to ensure reliability and safety.
By choosing a verified mobile app with excellent support, you can enjoy a seamless and stress-free cab booking experience in India.