Can a att phone be used on sprint

Can a att phone be used on sprint or I can change a cell phone at & t to sprint?
I am in company like sprint but I wondered models if you buy a at & t I could switch to Sprint regards
I can change a cell phone at & t to sprint?
I am in company like sprint but I wondered models if you buy a at & t I could switch to Sprint regards

Sprint and Verizon CDMA does not use SIM card.
Can not be released easily. Y GSM uses Att.
Another difference is the prices of almost 3 plans are the same individual plan.
In family plan are cheaper.
Prices in the three companies is just starting at $ 199 with a 2 year contract.

Data and messages only have unlimited sprint.

Best answer
You can swap phones from Sprint and At & t because they are different technologies
Sprint uses CDMA and AT & T uses GSM
Phones that could become compatible could be Verizon phones that are using the same technology that sprint cdma