Help fixing voicemail. Get message Invalid Number
I gave my dad one of my Sprint S2's (I have a few of them I use them as timelapse camera's) because he just hated his kyocera (he has hearing issues and a quirkk of the kyocera made it very hard for him to hear)
anyway its a sprint S2 so I had someone flash it to boost for me. the transfer went perfectly zero issues. everything works mms txt calls data you name it.
voicemail got reset but that seems to happen every time you change devices with boost. we reset it recorded a new greeting all was good.
now the next morning sister says she is getting an invalid number message when she calls pop. turns out she was going to voicemail and the voicemail system was saying his number was invalid.
I tried press hold 1 from the handset same message. I diales HIS numnber from the handset. same message.
how do I fix this? how do I "reset" the voicemail?