In Manali, the local language spoken is mainly Hindi and a local dialect called Pahari. It is helpful to know common Hindi phrases such as "Namaste" for hello and "Dhanyavad" for thank you. Some helpful resources for learning basic Hindi expressions include language learning apps like Duolingo and Rosetta Stone, as well as local language classes or phrasebooks available in Manali.
Manali has decent cellular coverage with major providers offering 3G/4G services. While Wi-Fi is available in most hotels and cafes, it's advisable to purchase a local SIM card for better connectivity. The standard voltage for power outlets is 230V, and plug types vary, so it's recommended to bring a universal adapter for your electronics.