Adding on a speaker component for louder volume?

Hello I am new member and had question regarding adding a speaker to my motorola V3 razr. My job is on call and sometimes I sleep kinda heavy and I rely on my cellphone to wake me up when my work calls. The V3 razr does have a decent speaker volume already, but I wanted to know if there was an additional speaker I can buy and hook up to my phone for even louder volume. If anyone can recommend a brand or have any experience with something I just mentioned I would appreciate any help. I saw some stuff on the web regarding a conference call device that may be added to the cell phone, but not sure if thats why I need or not. I don't really care about having a conference call or the quality of sound. Just needs to be loud to wake me up when a phone call comes through. Could be blue tooth or straight plug, dosen't matter. Any help or input would be much appreciated.

Thank you

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I did a quick google search and found pages of add on speakers (both blue tooth and non blue tooth).

Here's just a quick example of what I found-------> LINK

Thanks for the reply, now I have some idea what I need. Anybody else have some input. Would like to hear if anybody has dealt with any specific brand or can recommend a brand with high volume.