Greetings Libb, thank you for finding the unobstructed time out of your bustling day to ask us your question about the Samsung Galaxy A25. The advertised unlocked Galaxy A25 is compatible with AT&T, Boost Mobile, Cricket, Google Fi, H2O Wireless, MetroPCS, Mint Mobile, Simple Mobile, T-Mobile, Ting Mobile, Ultra Mobile, US Cellular, and Verizon. This device works on the 4G LTE and 5G wireless network. Being that this is an unlocked device, I suggest reaching out directly to Comcast to inquire if this device would be compatible on their wireless network. If you have any other questions for us, please feel free to reach out to Samsung Support. Thank you for being a dedicated Samsung customer. - Debra