McZ found a sim card reader with integrated voltage translation:
The TXS02326 is a complete dual-supply standby Smart Identity Module (SIM) card solution for interfacing wireless baseband processors with two individual SIM subscriber cards to store data for mobile handset applications. It is a custom device which is used to extend a single SIM/UICC interface to be able to support two SIMs/UICCs.
FEATURES
• Level Translator
– V_I/O Range of 1.7 V to 3.3 V
• Low-Dropout (LDO) Regulator
– 50-mA LDO Regulator With Enable
– 1.8-V or 2.95-V Selectable Output Voltage
– 2.3-V to 5.5-V Input Voltage Range
– Very Low Dropout: 100 mV (Max) at 50 mA
• Control and Communication Through I2C Interface With Baseband Processor
• ESD Protection Exceeds JESD 22
– 2000-V Human-Body Model (A114-B)
– 1000-V Charged-Device Model (C101)
• Package – 24-Pin QFN (4 mm x 4 mm)
Thanks McZ!
Buena información :)