You have limitation for your mobile networks in Ladakh. Only Airtel / Aircel and BSNL are the basic service provider in Ladakh. Air Tel and Aircel has limitation with their services all around in Ladakh region but BSNL is most preferred network in Ladakh at different parts. You are requested to take your postpaid mentioned connection only before you plan a trip for Ladakh. No prepaid connection work in Ladakh. You will have internet facility on your phone and wify at your hotel. Sometime facilities as such may be restricted due to heavy snow and other technical reasons.