Precaller has just introduced a new service -.
send 'top' or 'pre' to +447937987200 by SMS. Please check if this number is included in your text message bundle before sending multimple messages; this will depend on your mobile operator. Each SMS gets two credits
2 credits = 2p or such. I have checked with my operator and the text is a uk number so its free. I sent LOADS of texts using sms scheduler (free app on android phones) and netted LOADS OF credit! you can use your credit by dialing a 020 number from your mobile.
ps you can also use the credit to call 0870 numbers. mobiles etc.