Hello
I have received the phone but can only confirm earliest by 23rd as i travel on 21st. But i think you can go ahead and buy it from Apple . Do not buy from tmobile store. Also do not insert the nano sim that apple provides and start the phone or connect to iTunes. Straight away insert your international nano sim and you should be good to go.
I think one of our friends in previous threads has already confirmed that he is using the tmobile contract free phone bought from apple store with vodafone in india without problem
I also had word with both apple customer care and also tmobile and they said it will work out of the box
The tmobile lady also told me off records that contract free phones from apple store are basically unlocked . Only certain lte bands may not function. But in india lte is not an option right now .
In india the unlocked apple 16 gb phone is priced at 53500 and the tmobile phone from apple with taxes comes to around 43500 inr.
In india gold option is not available as of now as its out of stock.
I feel still if gold is not your color and you want peace of mind with warranty etc than you can buy from india. I would gave done it myself but i had already bought it here so decided to stick with it. If u buy from usa the warranty is not applicable in india, so it is as good as Grey market piece.
Think abt all this options and then go ahead
53500 may seem a lot but compared to 44000 its just 150 $ more but you get warranty and piece of mind out of the box
Else you can peacefully go for tmobile phone but BUY IT FROM APPLE STORE ONLY :)
I will inform you by 23 rd abt the status
Best regards