outside india phone

Sir i want ti know that what theproblemcomes when we use out of india phone means exported phone....is there anytechnical issue.....and from which country phone is good....like saudi,china,canada,Australia. ....plz help me sir....

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Best mobile to purchase

i am purchasing a new mobile within a week but confused which one to purchase since i will be using the mobile mainly in australia..the main features i am looking for is atleast 2gb ram,32 gb internal,sd support(not necessary),good battery life,decent camera,features,looks,easy portability.
1. moto x(2nd gen) 32gb
2.nexus 5(32gb)-this maybe a good option although it is older
3.lg g2

please suggest other phones..