Technically, the last statement is false. All cellular devices operate using a SIM card, they are essentially how a network service provider (I.e. AT&T, Verizon, et. al.) identify their devices and know what level of service to provide to the device when it sends/receives signals from their tower. Some USB wireless broadband devices do look like USB thumb drives, however, they will either contain an integrated SIM card or have a spot for a replaceable SIM card.