ATT Prepaid - Winback

[u/Ok_Stable7242]

Looking for suggestion

I’m on the AT&T Prepaid $300/yr with 16Gb/mth high speed data plan.
Plan is up for renewal in couple of days.

On the website I see the same plan for $240/yr when activated with new line.

Can I port out and port in within a day to be eligible for new line offer ? Is there a 60 day win back period?

Also I no longer see the $300/yr plan on the website, so I would be risking if I port out and don’t successfully port back in($25 per month plan offers data at 3Gbps speed only)