THe #1 thing to do is put the phone in Airplane mode. Also "low power" mode. Do both of these and I can go for about 4 or 5 days on one charge.
The effect of airplane mode is greater when you are out of cell coverage because the iPhone just ups the radio power if it can't find a cell tower and this will exhaust the phone very quickly. I was up in the mountains hiking for a couple weeks this summer and did not have cell coverage. I only had to use my phone charger once and I was constantly using the phone as a camera.
If you really need to save power in town. Airplane mode works too. Just turn the phone on for 5 minutes every hour or so to get texts and voicemails. Then back to airplane mode. The phone could last for 3 days on a charge.
The effect of airplane mode is greater when you are out of cell coverage because the iPhone just ups the radio power if it can't find a cell tower and this will exhaust the phone very quickly. I was up in the mountains hiking for a couple weeks this summer and did not have cell coverage. I only had to use my phone charger once and I was constantly using the phone as a camera.
If you really need to save power in town. Airplane mode works too. Just turn the phone on for 5 minutes every hour or so to get texts and voicemails. Then back to airplane mode. The phone could last for 3 days on a charge.