IPhone problems ( iMessage)?

When I message someone on iMessage sometimes my messages deliver to the other persons phone and sometimes they don't even when they say delivered so I have no clue that they haven't received them until I'm waiting hours for a reply and I text them again on iMessage asking if they have got my message they usually say no.
I have reset my phone, turnt it off and on, turnt iMessage off and on and it still does the same problem.
For example I can't have a conversation with someone as I'll message them back and the message says delivered but doesn't get to them so they must think I'm ignoring them when I'm waiting on a reply when they never got my message in the first place. Sometimes text messages don't sent either…
I was just wondering does anyone know why this is happening or do they know how to fix this as soon as possible!

How to keep VPN activated on iPhone?

So I got VPN activated on my iPhone 5s today and every time I lock my phone and I turn it back on the VPN is trend off and I have to manually activate it every time I want to use it. Does anybody know how to fix this? Thanks! (I use tunnelbear for my VPN service on my phone)

My iphone 5 is locked for Japan KDDI when i bought?

My iphone 5 is locked for Japan KDDI when i bought it, i have been using R Sim since thn and now updated my IOS to 7.1.2. After update i checked my imei on the imei checker to find out whether its still Locked but it says unknown, I tried inserting my sim without my R Sim which says under carrier My current network Dialog,. But when i tried using without R sim it takes me to activation screen, couldnt activate due to unsupported sim please help thanqMy iphone 5 is locked for Japan KDDI when i bought

How to unlock my iPhone 3GS on iTunes?

How do I unlock my iPhone 3GS on iTunes?

Added (1). I got a new phone which has recently broken so I'm returning to my iPhone 3GS for a bit until I get my new phone fixed. However, seeing as I haven't used this phone in 9 months, I don't remember the passcode. Is it possible for me to use iTunes to reset the passcode on my iPhone without restoring? This is purely because I know the newest IOS doesn't work so well on the older phones and I really don't want to have to ruin it. Any advice?

My iphone is broken and I don't know what's wrong with it?

First of all the front and back is cracked which I know how but can someone tell me what's wrong with the screen because when I turn it on or go onto an app or something you can see faded black lines in the background which are not suppose to be there. It is an iphone 4s btw. Also it turns off by itself sometimes.
Please could someone tell me what's wrong and how much it costs to fix?My iphone is broken and I don t know whats wrong with it

How to fix iphone screen after water damage? - 1

Have an iPhone 4, a few months back I spilled tea on my phone. It went funny for a few mins (grey screen, flicking lights), but then after about 10 minutes everything was fine except for one strip of my phone is unresponsive to touch. Like the row of apps on home screen, the whole second row segment doesn't work. Thankfully I have an ipad air and iPod 5gen so I can still use my devices to their full capabilities but it really hinders the experience of my iphone ie sending messages and searching the internet… So how do I get this fixed? The thing is I already got my cracked screen fixed a while back by a third party so i can't take it to apple. Do phone fixing companies know how to fix my problem and roughly how much do you think it would cost to replace. Thanks & sorry it's long I just thought I'd add all the deets