I'm invest in the gold so i want to know how they calculate the Gold Price?

I am in dubai with work permit. one of my friend told me we can get current gold prices thorough our mobile with out charge. is it possible? if yes let me know how?

I HAVE SOME GOLD COINS TO SELL AND GOLD PRICES HAVE DROPPED. I'VE HEARD IT WILL GO UP IN THE NEAR FUTURE. NEED TO SELL, BUT WAITING FOR IT TO GO UP.

also much of the 1gram pure gold make 1oz and what is the price to sell 1oz 999.9 gold because i have a lot of those 1 gram gold that was left from my great grandparents and my grandprarent. so im not sure if today price is good enought to sell it or that i should keep it for a longer preiod, but then im afraid gold price might drop next year. so what u recommend?