My iPhone 4S won't can't access the internet on Metro PCS

I have an iPhone 4S 8gb, and it is unlocked, its original carrier i think is att or tmobile but i placed in my metro pcs sim, i'm able to call and text but i can't access the internet. It says 4g next to my signal bar. And it also says tmobile instead of metro pcs. Like wtf, help. I think it is the apn setting. I tried fast.t-mobile.com and fast.metropcs.com. Wat can i do besides contacting metro piece of ****.

Try this APN settings: https://apn.gishan.net/settings/os_9_23_iphone_4_internet_and_mms_settings_for_metropcs.php

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