Mobile phone
96% cheaper than in Somalia
You can buy a SIM card for about 23.05 INR (148.19 SOS), which includes 1 GB of data plan. You can choose from 5 telecoms: Airtel, BSNL, Jio, MTNL or Vodafone - Idea.
Mobile phones
India uses similar GSM mobile networks (GSM 900 and GSM 1800) as Somalia so you should be able to normally use your mobile phone.
Roaming
If you don't want to buy SIM card in India upon arrival, make sure to check the roaming charges with your telecom provider before your departure so there are no surprises when you return home.