The four accused, identified as Nadeem, Shafiq, Alladdin and Wasim, were arrested from south Delhi and the robbed mobile phone and cash was recovered, police said.
The incident took place last evening when the 20-year-old Vasomo Phong Sore, a first year student of Delhi University was going to buy a recharge coupon after dropping his sister at a church on his motorcycle.
"When Sore reached near Hazrat Nizamuddin Dargah, four men stopped him, snatched his cell phone and Rs 400 and fled from the spot," said a police official.