As of now, we have no available options for flip phones given that we do not sell a flip phone compatible with Xfinity mobile. Additionally, even as a BYOD (Bring Your Own Device), we would not be able to connect cellular service to a flip phone. Currently for iPhone BYOD, we only support models iPhone 6, 6+, 6s, 6s+, or newer. For Android BYOD we currently support Samsung Galaxy S8, S8+, S9, S9+, and Galaxy Note 8, and 9.
Update - Officially, as of 12/10/19, the following devices have been added as compatible with BYOD - Google Pixel, Pixel XL, Pixel 2, Pixel 2 XL, Pixel 3, Pixel 3 XL, Pixel 3a, Pixel 3a XL, Pixel 4, Pixel 4 XL.
We greatly appreciate you taking the time post on the Xfinity Forum! It’ll be my pleasure to provide further details.
What you mention in your post, indicates the usage of an active SIM card on an unsolicited device. In many cases, customers who do this can and do retain full service and device functionality. In these scenarios, we are unable to guarantee service or satisfy any requests to make changes to the account.
On your end, the Xfinity Mobile (XM) app would not reflect the device that you are currently using. It would reflect the device that is officially assigned to the active SIM card. On our end, this type of scenario reflects as an unsolicited device being used on the mobile service line number.
We don’t recommend using your account and services in this manner. If you are experiencing functional and reliable service while using an unsolicited device, we can’t prevent you from taking those actions.
Let me know what other questions you may have regarding this, or any other topic related to your XM account and service.
Yes the cheapest way to do it is get a Verizon Kyocera Cadence LTE S2720. You can get them on Ebay for like $85.00 but make sure that it's postpaid. If you buy the prepaid version they will make you spend an additional$50.00 to get it released. So make sure it says postpaid.