Mobile Network in Leh Ladakh
This is advisable to have your post paid connections in Ladakh. Prepaid connections may not work. Air Tel / BSNL and Jio are common network at the moment.
Though you may have restrictions for the mobile networks at various places such as Pangong lake – Tso Moriri – Tso Kar Lake and others.
You may rely on Wifi connections in Leh only and destination such as Nubra Valley – Sham Valley may be restricted most of the time.