Find my lost iphone

For most people, the first reaction in this situation is to try to find the lost notes in the iTunes or iCloud backup files. Of course, you can get back your needed notes in these way, but they have some limitations and I think you should to take them into consideration:
1. You have made a iPhone backup with iTunes or iCloud, so that your needed data is included.
2. You can't restore only your needed data like notes to the iPhone, that means other data on your iPhone will also be replaced by the contents in the backup.
3. More data may losing during the restoring process due to unpredictable reasons.
Obviously, restoring notes from iTunes or iCloud is not a wise choice here, especially when you only need to undelete specific notes on iPhone. Thus, we could like to strongly recommend a tool called MobiKin Doctor for iOS for your reference. It is a standalone data recovery software for iPhone users, which allows you to recover only your needed files on iPhone, iTunes backup as you like. And you're also allowed to use it to undelete data like photos, contacts, SMS, safari bookmarks, etc. completely.
This could help you.
How to Undelete Notes on iPhone 7 6S 6 5S

no there is'nt any upgrade for that because it is factory fixed. buy a new iphone with a 32GB to meet your home's requirements.

Call your phones service provider. Do you have insurance?

if you have an app or tracer like-find my phone --you can sign in to it and activate but your phone needs to be on and have some battery life

Actually, there still are something you can do to try to find your lost iPhone.

Activation Lock, available on devices running iOS 7 or later, is tied to Find My iPhone. When Find My iPhone is turned on, Activation Lock is on. When setting up a new device, Find My iPhone is automatically enabled, but you can check to make sure it's turned on by following the below steps: Open the Settings app, tap iCloud, and set the Find My iPhone slider to On. You'll need to enable this setting on each device you want to track.
Then you can track and find your lost iPhone with the steps below:
1. Use the Find My iPhone app on another iPhone, iPad, or iPod touch. Or you can sign in to icloud.com/find on a Mac or PC.
2. Tap the "My Devices" button at the top-left corner of the window on an iPad or iPhone. Select your lost iPhone from the list of devices (If you have other devices associated with your Apple ID, such as an iPad, it will be listed here as well). Or click the Devices menu at the top of the page if you are using the iCloud website.

Note: If your iPhone cannot be located because it is turned off or out of network, check the "Notify me when found" box. As soon as the iPhone is turned back on and connected to a cellular or wireless network, you will receive a notification at your Apple ID email address.
3. If your iPhone is online and "Find My iPhone" can locate it, the map will center on your iPhone's last-reported location. You can use this map to determine where you may have left it.

4. If your iPhone is lost nearby, you can click or tap the "Play Sound" button to make the iPhone play a notification sound. This will be played at maximum volume, which can hopefully help you track it down. Tap "OK" on your iPhone to stop the sound from playing.
5. You can also choose "Lock Mode" to lock the iPhone's screen with either your preset passcode or a new one if you don't have one set. You can also add a contact number and message that will be displayed on the screen if a nice person finds
6. If the iPhone is gone and you don't think you'll be able to recover it, you can choose "Erase iPhone" to wipe your iPhone of all your data. This is a last-resort option, and should only be chosen if you are worried sensitive or personal information will be revealed. If your iPhone is passcode-locked, your information is not retrievable.

For more details, check: How to Find Your Lost iPhone

If you turned on "Find My iPhone" option on your lost iPhone, maybe you can find back the iPhone. Just follow below steps.

1. Use the Find My iPhone app on another iPhone, iPad, or iPod touch. Or you can sign in to icloud.com/find on a Mac or PC.

2. Tap the "My Devices" button at the top-left corner of the window on an iPad or iPhone. Select your lost iPhone from the list of devices (If you have other devices associated with your Apple ID, such as an iPad, it will be listed here as well). Or click the Devices menu at the top of the page if you are using the iCloud website.

Note: If your iPhone cannot be located because it is turned off or out of network, check the "Notify me when found" box. As soon as the iPhone is turned back on and connected to a cellular or wireless network, you will receive a notification at your Apple ID email address.
3. If your iPhone is online and "Find My iPhone" can locate it, the map will center on your iPhone's last-reported location. You can use this map to determine where you may have left it.

4. If your iPhone is lost nearby, you can click or tap the "Play Sound" button to make the iPhone play a notification sound. This will be played at maximum volume, which can hopefully help you track it down. Tap "OK" on your iPhone to stop the sound from playing.
5. You can also choose "Lock Mode" to lock the iPhone's screen with either your preset passcode or a new one if you don't have one set. You can also add a contact number and message that will be displayed on the screen if a nice person finds
6. If the iPhone is gone and you don't think you'll be able to recover it, you can choose "Erase iPhone" to wipe your iPhone of all your data. This is a last-resort option, and should only be chosen if you are worried sensitive or personal information will be revealed. If your iPhone is passcode-locked, your information is not retrievable.

For more details, check: How to Find Your Lost iPhone

This must be setup on the phone before it is lost or stolen.
Follow the tutorial below.http://mobilephones.pk/reviews/how-to-track-your-apple-iphone-tutorial-pictures/

through itune software, just put the file that has the songs in the down left side of the itune screen, then start sync