Yep, easy. I pay 8€/month for 3GB, which is plenty since I'm connected to Wifi most of the time.

And I paid 220 for my phone, which easily lasts 2 years.

That said: As a self-employed programmer, I think 20$/month for increased productivity is a steal!

Yes, why would it be any higher? My phone plan is around a tenner a month and over the lifetime of my phone, the cost per month is definitely less than that.

No, just the phone. I use the call/text/data plant so little since I'm mostly on wifi anyway, so I left that out.