Question: Which formats are used by the other brands of phones, like Samsung, Ericsson or
Answer: They use proprietary formats. Refer to your user's manual for the proper method for entering ringtones with these phones. If you don't have access to your manual, visit the manufacturers' page where you can find links to their web sites. Most manufacturers actually offer web-based versions of their owner's manuals on their web site for free.
You can also find free pre-coded ringtones for your brand of phone right here on this site.
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