I suggest you can approach Superunlockcodes.com and specify the country,locked network of Samsung SM T355.Based on the availability you can get the permanent unlock service along with free instructions.
SOURCE: I have just acquired a Samsung Galaxy Tab A, SM-T355Y. How do I get an Internet connection?
1.Open the notification panel by swiping the two fingers slightly from the top of the screen to the bottom.
2.You will see the Wi-Fi icon at the top of the panel.You can touch the icon to turn Wi-Fi on.
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