Is my iPhone about to be become obsolete?

I bought it just three years ago and I won’t be very pleased if Apple stop supporting itEvery week a Guardian Money reader submits a question, and it’s up to you to help him or her out – a selection of the best answers will appear in next Saturday’s paper.I’ve just discovered that my iPhone 6s, which I bought for £300 only three years ago, won’t be getting any iOS software updates after September. Is this something I should be worried about, or will it c