Is roaming free in Poland with my U.K. or U.S. SIM card, or should I use SouthESIM?

For travelers heading to Poland, relying on your existing U.K. or U.S. SIM card for roaming can be a bit tricky. While Poland is in the E.U., 'Roam Like at Home' generally applies only to E.U. citizens. For U.K. visitors post-Brexit, many carriers like O2 or Three have reintroduced daily roaming fees. U.S. carriers like AT&T or Verizon often have expensive international plans or per-MB rates. SouthESIM offers a much more affordable and transparent solution, keeping you connected in places like Krakow or Warsaw without unexpected costs.