Era introduces a new roaming tariff (parallel to the existing one). It's zone-based in postpaid. New zones (identical to postpaid ones) are introduced in prepaid.

Main features:
1) The same rate for incoming and outgoing calls (=> rates to the country you are in may increase even 10-15 times!)
2) The above rule also affects CSD calls - ther's no sense to use local access numbers since calling them is as expensive as calling "native" access number in Poland.
3) Debiting 60/60 for all calls
4) Setup fee in postpaid: 1.50 PLN (0.38 EUR) business plans, 1.83 PLN (0.46 EUR) "private" plans
5) Weekly fee in prepaid 5PLN (1.25 EUR)
6) Flat rate for SMS 1.83 PLN (0.46 EUR) business plans, 1.95 PLN (0.48 EUR) "private" plans
7) New Zone 0 "T-Mobile" (T-Mo networks in: Austria, Croatia, Czech Rep., Holland, Germany, Slovakia, Hungary, UK, USA) with the lowest per minute rates:
1.83 PLN (0.46 EUR) business plans, 2 PLN (0.50 EUR) "private" plans, 3 PLN (0.75 EUR) prepaid

No info about the GPRS/MMS rates.

Despite the "weekly fee" rates in prepaid seem to be better for most destinations but as to postpaid uhmmm... :unsure: