T-Mobile Is Giving Out $100 Rebates To LG G4 Buyers: Here's How To Claim It T-Mobile launches a $100 rebate offer on the LG G4 which allows users to get hold of the device at a tempting price of $380. Customers should be able to buy the handset before Nov.6 and redeem the offer by Dec. 6. by Menchie Mendoza