IPhone4 Won't Sync with Itunes?

This i think gets asked a lot but I'v Tried Everything under the sun & my Iphone 4 (which is fully up to date) Will not sync with my Itunes (Which is also up to date)
I have tried the famous turn the Iphone & laptop off & back on again to de-authorizaing & re-Authorizing my computer.
Iv uninstalled & re-installed Itunes
Iv went to preferences made sure the "prevent itune from syncing automatically" box was unchecked.
Iv changed charge cords & tried all my UBS Ports! NOTHING WORKS Id like to update my music its been 2weeks & the problem not fixing itself.
to continue yes i unlock my iphone "passcode" but the "trust or not to trust" notification doesn't come up which makes me think Itune isn't detecting my Iphone at all. Have i missed anything?

Iphone 6s won't sync to Itunes?

I have a Macbook Pro that I got back in 2010. I'm currently using Mac OS X version 10.6.8. I know there have been major updates since my computers debut, however, this was my first Mac so I'm in no means tech savvy to know what's up!

Anywho, my Itunes is currently running 11.4. I'm currently using the Iphone 6 and using the 9.1 software. For all the previous new software updates that Apple has been making for the Iphones, I always update through my phone and not my computer. I have never had an issue after updating my software and connecting and syncing to my Itunes. I just backed up my iphone 6 to my Itunes a few moments ago.

Now my question is why is my new Iphone 6s plus not syncing to my Itunes. It is letting me know that i need to download Itunes 12.3.1 for OS X. From what I have been reading on other posts is that the new Itunes 12.3.1 is not compatible with an outdated Macbook like mine. So does that mean that I will not be able to download the new version of Itunes, which will leave me unable to sync my new Iphone to my Itunes? How does any of this makes sense? The thing that really confuses me is that my Itunes allows me to sync my current phone which is running the 9.1 software to my Itunes 11.4?

If someone could please share some insight, that would be greatly appreciated! Am I going to have to choose between my 3,200 songs and well develop Itunes or a new Iphone 6s which I will have to start from scratch?

Can you use H2O iPhone 5 with cricket?

I got an iPhone 5s from a friend. It used H2O carrier and off contact. I use cricket and was wondering how to switch over. I want to keep cricket but I don't know if the new iPhone is locked or not. How can I unlock it to use cricket?

My iPhone 4s fell into the water (broken power switch)?

My iPhone 4s fell into the water (2-inches deep)yesterday but was only soaked for a seconds.

I wipe all the water and went to the car dry my phone in the air conditioner.

My iPhone 4s power switch is broken and I can't switched it off immediately after but instead I turned on my airplane mode and turned off my Wi-Fi so no calls or messages and notifications will appear. This means that my phone screen is still working after being soaked.

I left my phone in my house for 5 hours and when I went back the phone was dead.

Now, I put my iPhone 4s in a closed container with rice.

What else should I do? Should I bring to someone who can open it? Or wait for the iPhone for about a week in the container and try opening it again?