Hi,
First of all, do the needs analysis:
1. What are the usage requirements of each category of employee? For example, employees who need to contact vendors, business partners (HR, Admin, Sales, Marketing, Business Development) have higher usage needs, so the limit should be different from other supporting functions.
2. Check the requirements by grade.
3. Consider voice and voice + data usage. For instance, those who use heavy attachments and emails may require larger data. For example, at Rs. 650 per month, you get unlimited 3G data, so you may add an additional 700 for people using data.
4. Establish the process.
5. Determine whether the entitlement is automatic or on a case-by-case basis.
I hope this information is useful for you.