Is there a minimum balance usage during a certain period of time (what period?)concerned with SPS PrePay SIM cards?
Each voucher has expiration period according to voucher value as follows: Units Validity 25 3 months 50 3 months 100 6 months 250 6 months 500 12 months 1,000 12 months 3,000 18 months 5,000 24 months Upon an early top up the remaining portion of validity period of (partially) unused voucher will be added to the expiration period associated with next voucher top up. However this will be shortened to 24 months, as this is the maximum validity period that will be allowed. The total maximum unit validity period for any credits cannot at any time exceed the longest validity period available for any of the vouchers i.e. 24 months. With voucher expiration period ending unused SIM balance will be lost.
