SAO PAULO, July 31 (Reuters) - Brazilian telecommunications operator TIM reported on Monday a 104% jump in its second-quarter net profit, boosted by mobile phone services.

TIM Brasil, controlled by Telecom Italia, posted a profit of 638 million reais ($135 million) in the April to June period.

($1 = 4.7241 reais) (Reporting by Peter Frontini; Editing by David Alire Garcia)