Presently have a sprint government plant for one phone but want to use another vintage phone because it is much smaller than current phones. Have the LG LGLI ACEM phone and would want to use it from time to time. This phone was issued to me by sprint years ago. I am not handcuffed to Sprint but there might be some advantages to using the sprint network. Looking for guidance on how to get the lowest plan that does not nibble minutes or add fees overtime. If there is such a plan that I can pay for a specific amount of time and the balance remains. I might want voicemail included but it not necessary. A predictable balance is the highest priority. Guidance sought.