Can I get a cingular go phone and stick my sim card in it and it still work?

Ya sure you can use the sim in the go phone only if it is unlocked one else if the new phone is locked to some other network provider then it wont accept any other GSM sim until you unlock it ..You can easily unlock the phone through online providers like TheUnlockSpot.com here they are rendering network unlock code for all mobile models at reliable cost ..You first check that whether the code is available for your mobile model ,country and network provider .If yes then pay for it and unlock the phone then freely use it with any GSM sim ....