When you travel from country to country??you maybe always change your SIM card.This new model of SIM card holder can help you not lost your SIM card.Original version have 1 Nano SIM card storage the adpater can also be 2 Nano and 1Micro SIM card storages.It's turely travel mate</br>If you change your phone??the old SIM card type can not fit your new phone.Don't worry.There have different SIM card adapters 1Nano to Micro 1Nano to Standard 1Micro to Standard.The high quality adapters can fit your SIM card and phone SIM card slot high quality sim adapters & sim cards now tightly</br>Build-in High Speed USB/OTG MicroSD card reader and storage. Additional storage for your phone??To prevent your MicroSD card lost and c