SI Smartphone Printer is a free multimedia app developed by PRINICS Co. Ltd for Android devices. It allows you to print amazing photos by connecting your smartphone or tablet to the printer via Bluetooth. The app is compatible with several models, including SI Smartphone Photo Printer SKUWi-Fi Model), SI 2x3 Instant Camera SKU, SI Smartphone Photo Printer SKU, and SI 3 inch Instant Printer SKU.

To use the app, you must first recharge the printer and connect it to the adapter properly. Then, turn on the printer and find the printer's MAC address in the Bluetooth settings. Select an image from the gallery or take a photo with your smartphone, edit it according to your preference, and press the print button located on top of the printer.

It is advisable to update the firmware when printing for the first time, which may take about a minute to fully print. Please do not pull the photo until it is completely printed. If you are using the Wi-Fi model (SKU), you must put the password as "" when connecting Wi-Fi.

Overall, SI Smartphone Printer is a convenient app for printing your precious moments and is easy to use. The app's compatibility with several models makes it versatile and a great addition to your photography essentials.