Regulatory filings for a new phone from TCL bear the name "REVVL 4+" and describe a phone supporting all of the network bands unique to the T-Mobile/Sprint network. Since 2017, T-Mobile has offered a series of white-label phones under its own "T-Mobile REVVL" brand. Most of the first and second generation REVVL phones were made by TCL. Last year's REVVLRY and REVVLRY+ were the third generation, and the first to be made by Motorola. The filings reveal very few details about the phone, except theFCC approvalconfirms it will have NFC, and theBluetooth SIG approvalconfirms it will have Bluetooth 5.0. The Bluetooth approval for this phone is shared with the TCL 10L, indicating the REVVL 4+maybe based on the 10L. The TCL 10L is a mid-range Android phone with a Snapdragon 665 processor, 48 megapixel main camera, wide-angle camera, and "Super Bluetooth" supporting up to 4 simultaneous connections.