Na openline ko na po yung B312-939 and nag try po akong ilagay yung Dito sim. Malakas naman yung download
(5 - 10mbps) but yung upload is mabagal (0.2 - 0.5mbps) may idea po ba kayo paano palakasin yung upload speed? Or any APN na compatible sa B312-939?