I was wondering if i jailbreaked/unlocked my iphone using ***sim for international use, lets say a telco in asia.

Will i be able to use the iphone when im in U.S through roaming with my telco? or i'll have to reverse and crack all over again?

anyone experience the condition?

Yes It will get roamming and if it doesnt work you just buy any prepay sim and insert it and it will work, i use my Iphone in Puerto rico, California and Mexico