Android 1.5 Dialer App - Exploit Block

I just read about the remote USSD attack . My hoary old Samsung i7500g phone is vulnerable (confirmed via this site ). The solution is to install a (free) secondary dialer, like Dialer One. Unfortunately, since my phone is running on 1.5 (I know, I know!), I can't download any apps through Google Play. Furthermore, an alternative download on AndroidDrawer told me that "this app is not compatible with your phone" -- presumably OS related. Okay, so, what are my options? Is there a free dialer I can use that will, as explained here , at least prompt me which dialer to execute the command with?