Plus (formerly Plus GSM) is the brand name of Poland's mobile phone network operator, Polkomtel Sp.

It operates GSM (900/1800 MHz), UMTS, LTE, 5G NR (2600 MHz TDD) and WLAN networks in Poland.

From 1998 until 2002, Polkomtel used the Italian animated short cartoon La Linea to promote its Simplus prepaid service.

[1] From 13 May 2011, all of Polkomtel prepaid services are now called Plus na Kartę.

[2] In July 2011, Zygmunt Solorz-Żak agreed to buy Polkomtel SA for 15.1 billion PLN ($5.5 billion).