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Vivo V15 pro not picking up 4G for att but same phone picks up 4G for Airtel( indian carrier) on att

The Vivo V15 pro is missing 1 3G band (850) and has only one LTE band for AT&T ( 5/850).  It’s lucky it works at all.  AT&T HSPA/HSPA+ is equal to 3.5G and may show as either 3g or 4G.