Xfinity Mobile is offering $300 back when you buy new iphone or Samsung phone.
e.g. iphone 8 – 256 GB – $699.99 – $300 = $400
https://www.xfinity.com/mobile/shop?tab=devices&page=1&brand=APL&CMP=ILC:ACQ:BAU:ALL:COM:XFM:hp_aspot_apple-bdoty
https://www.xfinity.com/mobile/shop?tab=devices&page=1&brand=SEA&CMP=ILC:ACQ:BAU:ALL:COM:XFM:hp_aspot_samsung-bdoty
Prepaid Card offer ends 9/30/18. Offer requires purchase of a qualifying Apple or Samsung mobile phone, activation of a new Xfinity Mobile line for that phone within 60 days of phone purchase and porting of phone number for that phone to Xfinity Mobile for each new line. Must remain an Xfinity Mobile customer with an account in good standing for the first 90 days following Xfinity Mobile line activation. Prepaid card issued by MetaBank,® Member FDIC, pursuant to a license from Visa® U.S.A., Inc. Prepaid Card mailed to Comcast account holder within 16-18 weeks of activation of all required services and expires in 180 days. New purchases only while supplies last. May not be combined with other offers. Not valid with prior purchases, returns or exchanges. Limit up to $1500 in prepaid card amount per customer/account. If multiple lines ordered, one or two cards (depending on the total amount) issued for the total qualifying amount.