drumster:1 I had to e mail Virgin to get the exact definition which I'm pretty sure included a limit of 360 days/one year.
2 I have done similar with other networks but can't remember which but remember that 180 days was mentioned and no other figure.
3 CPW's monthly brochure used to/does state on the PAYG page the frequency of calls which was 180 days for the four main networks.
4 T-Mobile's GET MORE says 90 days.
5 A Fresh 'top up' only lasts a month then you lose any unused credit.
Looking at the above suggests to me that I am a sad figure straying into anorak territory. :-)
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I have the Fresh T&C's in front of me, They are in respect of a Fresh SIM (only) bought in 2002.
7. Ending the Agreement.
In addition to anything else we can do, we may end the agreement or suspend the service or both at any time without telling you and without incurring any liability to you if:
d) You do not use the phone for 60 days when we will have the right to disconnect your SIM card. "Use" in this context shall mean that you make at lease (their spelling) one outbound call in any continuous 60 day period.
There is no mention of losing any credit at any time due to non use or any other reason. However the initial £5 "Free" credit when the Sim was first bought only lasted 14 days and was then lost (from my memory)
Circumstances alters cases!!