Techniques for mobile devices to receive real-time digital TV are disclosed. To make such mobile devices (e.g., smart phones) readily usable regardless of what standard a local TV broadcast may comply with, more than one demodulators are provided. Each of the demodulators is implemented in accordance with one type of TV standard. Based on the received TV signal, a corresponding demodulator is activated to demodulate the TV signal. In one embodiment, the demodulators are implemented in software modules. Thus a missing demodulator may be downloaded from a designated site when a mobile device is configured to detect that a new demodulator needs installed to process a received TV signal.