Calendar items added to iPhone 4S don't sync to icloud or other devices

Welcome to the Apple Community.

I have different apple ids for my iPod, iPad and iPhone but one iCloud account.

What exactly do you mean by this, if you use the same iCloud account on all devices, you use the same ID.

not true, you can use 1 ID for icloud and a different ID for store/facetime etc.

OP-

First what you need to do is isolate which device is not communicating with the cloud. You said you have several different devices, so pick one, enter a test event in your calendar and see if it shows up on the other devices. If it does, that device is fine. erase that test event and move on to the next product- create a test date and make sure it shows up on the other products calendars.

also go in to calendar app, in the upper left you will see a button that says "calendars" tap there and make sure all calendars are selected under icloud.

I would check that setting on each device.

Eventually afteradding a test date on each device you will find one or two that are not communicating that change with icloud. as long as the calendar settings are fine, go to settings>icloud>turn calendar OFF (yes keep a local copy) wait 10 seconds then turn it back on.

and this should be obvious but make sure calendars are ON in icloud settings for all devices 🙂

the below article says you can try a calendar refresh button as well in your calendar settings. by golly i never even knew that button was there. try that first! lol

http://support.apple.com/kb/TS3999 troubleshooting icloud calendar

igi try what i said above.

also I dont know what you mean by syncing multiple apple id's. you use one icloud account- which is good.

but are you using a different store account for every device as well? you're making this way harder then it need be.

try that calendar refresh button first- i didnt know about it until i actually wen through and read that article. it might help.

tap on calendar app>click calendars button in the upper left, then at the bottom there is a arrow in a half circle (refresh button) try that on each device.