I tried a comfortable dual SIM with a cheap smartphone "Moto G 4 Plus" compatible with 4 G & 3 G dual standby (simultaneous standby) - GIGAZINE
Motorola Moto G4 XT1622 Dual-SIM 16GB (No CDMA, GSM only) Factory Unlocked 4G/LTE Smartphone - White - Newegg.com
Motorola Moto G4: Removing and Inserting the SIM Card & Memory Card (11 of 11) | Consumer Cellular - YouTube
How to unlock Motorola Moto G4 | sim-unlock.net
BNIB Motorola Moto G4 Plus XT1642 16GB White Dual-SIM Factory Unlocked 4G GSM | eBay
Amazon.com: Motorola Moto G4 Plus XT1642 16GB Single-SIM (GSM Only, No CDMA) Smartphone - International Version with No Warranty (Black) : Cell Phones & Accessories