Smart Postpaid SimOnly a Scam?

Got a question and see if some of you experiencing the same. Locked in for 2 years, then after that period downgraded to sim only for Plan 999 with 15GB data. But they have this promo of Unli 5G for 12 months. Since Metro Manila lang naman ako, always on 5G pero parang ang bagaaal? I mean when I’m outside with friends whos also Smart and 5G for comparison, no problem with their connection. This is on different locations and instances. Sometimes ung messenger ko it just say sending… it only sent when I toggle on and off the data.

Not sure if this cud be my phone unit, but everything is up to date—the apps, the iOs 18.1. Started experiencing this after switching to Sim Only Plan. Checking if u guys experiencing the same? Thank you.

ps: not a heavy data user, got wifi at home.