Longer ringtone Samsung Galaxy Centura..Straight Talk?

[Android Question]

How do I increase my ringtone on the Walmart Straight Talk Samsung Galaxy Centura running on Verizon network? I know I have to find out my voicemail deposit number, but it doesn't show up when I press 1 for Voicemail? Any idea how to find out the voicemail numbers that Verizon/Straight Talk network use so I can code it out for 30 seconds. Thank you

 

[Mr. Lucky]

Leave yourself a voice mail message. The callback number in your notification bar will be the number you are looking for.