In 2020, carrier T-Mobile acquired Sprint. Over a period of time in 2020-2021, T-Mobile is slowly migrating Sprint users onto the T-Mobile network. Once you have been issued a new T-Mobile SIM card you will need to have your eDispatches account administrator switch your carrier from Sprint to T-Mobile in the eDispatches portal. Failure to make this switch after you change networks will result in missed messages.
For instructions how to change your phone carrier have your account administrator make these changes. Update/Change Phone Carrier