If a US cell caller in Sweden is calling a US cell in the USA can they just dial the number or do they need to use the exit code + destination code + phone number? I am assuming I am correct in believing from earlier posts that a US cell caller in the US just has to dial the regular # to get this US cell caller in Sweden.
Your assumption about the US caller in the US dialing to a US caller traveling overseas is correct – they just need to dial the regular US number, as if that person were still in the US.
When dialing from overseas however the exit code and country code are needed to reach a US cell in the US or even a US cell located next to the person placing the call. So, from Sweden you would have: 00 1 aaa xxx xxxx to reach a US phone number. aaa is the US area code.