Question: I'm looking for a mobile app that lets my technicians update job status and communicate with customers in real-time.

If you're looking for a mobile app that lets your technicians update job status and communicate with customers in real-time, Workiz is a good choice. It's a full field service management platform with scheduling and dispatch, invoicing, customer management and a mobile app. The platform is geared for companies in industries like HVAC, plumbing and construction, and is designed to automate and optimize their operations.

Another good alternative is ServiceM8. This job tracking and customer relationship management software is geared for trade contractors and home service businesses, helping them streamline their operations from the initial call to the job completion. It includes job management, quoting, invoicing and communication tools, so you can keep customers informed and track jobs easily.

If you're looking for a more general-purpose real-time communication service, PubNub is a robust platform with chat, push notifications and location sharing abilities. It's geared for managing and optimizing real-time applications, so it's a good fit for companies that need to communicate in detail with their technicians and customers.

Also worth considering is QuickBlox, which offers instant messaging with APIs and SDKs for Android, iOS and web apps. The service supports chat, voice and video calling, push notifications and secure file sharing, so it's a versatile option for real-time communication in many industries.