Service levels are excellent, replacement vehicles always available and the billing process is simple. As for stationery, care needs to be taken in selecting a system compatible with your needs. Sufficient lines need to be available to allow your clients and staff the necessary level of access. Professional advice should be sought either through the portfolio department or one or both of the major service providers. The system chosen should be flexible enough to accommodate changes that might occur in your agency's size or role.
Mobile phones are available through government contract from either of the major suppliers.
At the time of writing, digital and analogue systems have their own strengths and weaknesses. Select the one that best meets your requirements. You may also need to consider whether beepers or pagers are necessary. Links with the portfolio department may or may not be necessary but are unlikely to determine the sort of system required as technology now allows a fairly free flow of data between systems. Independent advice on how best to address your needs is available in this field.