You can now buy Lycamobile UK sim in India before you travel. You just have to insert it in your phone in Heathrow Airport and you can call India. Lycamobile UK is probably the most cost effective option at present. Get a Lycamobile UK SIM for internet data & Voice.

the common question is, Can you advice if this Lycamobile UK would be useful to me while traveling to UK? I would mostly require mobile data in all cities including London? Then look no further – Just buy Lycamobile UK SIM Card in India and get Number before your UK Travel

Lycamobile UK SIM plan works well on a UK SIM card. Using the two packages for both voice and data is just awesome.

Buy Lycamobile UK SIM Card in India