That is such a ridiculous question I don't even know how to respond.
1. you can't use an mp3 on your iphone (I think you know that)
2. itunes is on your iphone
3 you don't need itunes on your computer to get ringtones/songs on your iphone, and then set a ringtone/song for your alarm (you don't even need a computer; you do need an iphone). it is, however, incredibly easy and intuitive to do this. I am sure you can figure it out
I just google'd and found this:
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How to Set an MP3 as a Ringtone on an iPhone
Apple's iPhone provides smartphone capabilities and allows you to customize it with unique ringtones. You can make a ringtone from an MP3 file, but you cannot automatically add an MP3 file as a ringtone. However, iTunes will let you convert any song you already have to the correct format. After renaming the files, your iPhone will recognize it as a ringtone as long as it's no longer than 30 seconds, the iPhones ringtone length limit.
Start iTunes, and find the song you want to use as a ringtone. If you haven't added it to your library yet, drag and drop the song into iTunes from its folder.
Right-click the music file to view its information. From the "Options" tab, you'll want to specify a start and end time for a total of 30 seconds. For example, if the song starts at 2:30, it must end at 3:00 to meet the maximum requirements for ringtones on iPhones. Click "Ok" to close the tab.
Right-click the song once more, and select the option to create an AAC version. ITunes will convert your specified 30 seconds into a new song.
Open another folder to temporarily store your AAC copy. Click and drag the song from iTunes to this new folder. Alternatively, you can just drag it to your desktop if you find this easier. Delete the clip from your iTunes library.
Reset the start and end times of the original song, otherwise the device on which you are playing the song will not play the whole song, just those 30 seconds.
Right-click and choose "Rename." Type in ".m4r" after the file name so it will be "[Song name].m4r". Hit "Enter" or click on a blank space in the folder. Renaming switches the file format to make it compatible with your iPhone.
Double-click the file, and iTunes will automatically open it as a ringtone.
Sync your iPhone and the song will now be in your ringtones list.
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WTF!? Are you kidding me??
With an Android, you just copy the mp3 on to your phone, then choose the file that you want for your ringtone (either the default, or for a particular caller).