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How to convince your dad to let you buy ringtones
Ask yourself why you want new cell phone ringtones.
If you want them for showing them off with your friends, maybe it's not a good idea. If you want them just for your fun or for identifying quickly your cell phone when someone's calling you, go ahead.
Check in magazines or online for various ringtones. Some sites may be more expensive than others even if they both offer the same products.