anyone still using this YES 5g plan?

Signed up for the free 30 days trial using esim on my phone. Only able to detect 4G speeds during speed test even though the coverage check showing there is 5g coverage in my area.

Planning to get Zyxel NR5103E modem to use with the SIM. Would it be better at pulling 5G connection?

And if the connection is bad. Is it difficult to cancel the subscription? I heard have to go physically to Yes centre in KL.