A cellphone or smartphone that uses the GSM cellular system and TDMA air interface. In the U.S., AT&T and T-Mobile are GSM carriers. Contrast with CDMA phone. See GSM.
"GSM phone." YourDictionary, n.d. Web. 24 May 2018. <http://www.yourdictionary.com/gsm-phone>.
GSM phone. (n.d.). Retrieved May 24th, 2018, from http://www.yourdictionary.com/gsm-phone