SPRINT SERO CELL PHONE PLAN -upgrade eligible, You can add any smart phone - Only for $150. This is a grandfathered Sprint SERO 500 minutes $40/$50 Phone Plan. SPRINT SERO! 500 Minutes Unlimited Text & Web(Data) Unlimited Nights @7PM & Weekend Mobile to Mobile free. Sprint to Sprint free. $40/Month+tax! Unlimited roaming and unlimited data. You need to open or already have a Sprint account with SERO or similar employee EPRP/SERP type plan. This plan is $40 plus tax plan for use with most 3G Android and Windows smart phones Or upgraded to the $50 plus tax plan to include any smart phone (4G Android, iPhone, etc) Currently I''m out of contract and phone is eligible to upgrade right away. You can get a free phone or discounted sprint phone or use your current sprint phone after you take over this plan