Popular smartphone brands Sony, Videocon and Sansui on Monday announced to partner with Reliance Jio Infocomm Limited to make the Jio Preview Offer available on their 4G smartphones. The Reliance Lyf a Reliance Jio 4G handset Consumers buying these 4G smartphones can avail the Jio Preview Offer at all Reliance Digital stores including Digital Xpress and Digital Xpress Mini. As part of the offer, customers can enjoy unlimited access to Jio services for 90 days from the activation of Jio SIM. Jio's 4G-LTE services include unlimited HD voice calls and video calls, unlimited SMS, unlimited high-speed data and a host of Jio Premium apps such as JioPlay, JioOnDemand, JioBeats, JioMags, JioXpressNews, JioDrive, JioSecurity and JioMoney. In a move to counter Reliance Jio, telecom major Bharti AirtelBSE -0.68 % has slashed 4G and 3G mobile internet charges by up to 80 per cent to as low as Rs 51 per gigabyte (GB) under a special scheme. To avail this benefit, AirtelBSE -0.68 %