Gangs of thieves snatched mobile phones from 34 people in just two areas of the city last month.
The thieves – some riding bikes – targeted victims in the city centre and the Hinckley Road and Narborough Road area.
The number of attacks is almost three times the 12 thefts reported to police in the same areas in October.
Police have warned people to be on their guard and to avoid using their phones in poorly lit or secluded areas.
Officers are staging extra patrols in the affected neighbourhoods.
Sergeant Rod Smart, of Hinckley Road police station, said: "We are advising people to be cautious when walking around using their mobile phones.
"If possible, walk in well-lit areas and close to buildings so it's not so easy for cyclists to grab the phone, and try to be aware of who's around. If you do unfortunately become a victim of this crime, please report it as soon as possible."
Sergeant Jim Smallman, of Mansfield House police station, in the city centre, said: "If a person has their phone stolen they are not only losing the handset, which may be very expensive, they are potentially also losing photos and videos of special events, along with key contact information.
"I urge people to take on board the advice from police."
There was a similar spate of thefts in both areas earlier this year.
A 26-year-old woman, whose phone was snatched in the city centre, said: "A kid with a hood over his face came up behind me and snatched my phone out of my hand. I'm really careful now whenever I'm out.
"I look around before I take my phone out and make sure I only use it when I feel absolutely safe."
A 16-year-old boy has been arrested and questioned about 14 phone snatches. He has been released on police bail until the new year.
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