Phone (1) vs (3a) Pro

Hi.

I currently have the Phone (1) and thought about upgrading to Phone (3) before it was announced. Now... I don't really do that anymore. (yes, the design, etc; but also the price).
I am in Germany and have a 15€/month EU-wide unlimited data (5G "up to the speed that is available"), unlimited calls/SMS, etc Phone contract with Deutsche Telekom, that I can cancel monthly with 14 days of notice.

Now the question: I have the option to make that a 24 month contract for 25€/month with otherwise the same conditions, except that it includes a phone. (1€ "down payment").
So I could basically get a Phone (3a) Pro for 241€, if I don't switch phone provider in the next 24 months.

Would that change be worth it?