When can I sell the gold I've purchased on PhonePe?

You'll be able to sell the gold you've purchased on PhonePe only 24 hours after you've purchased it. Please also note that in certain cases, due to security reasons, this time maybe extended upto 5 days.

What is the difference between the gold buy and sell price?

While there's no difference between the gold sell and buy price that you see on PhonePe, when you buy gold, the total payable amount will include 3% GST and service charges. 

Note: The live gold buy and sell price will vary based on the changes in the commercial bullion market and is valid only for 5 minutes and 4 minutes, respectively, from the time you initiate it on PhonePe.