In the Philippines, the minimum wage here is around $225 a month. I think it's around 5% - 10% depending if prepaid or post paid. We have a lot of promos here from telephone companies such as unlimited calls and text messaging for the same network which exists on prepaid accounts. I personally spend 10% of my income for phone airtime since I have to call my relatives abroad at least once a month. In the office, we chose to have an extra sim to subscribe for unlimited calls for our airtime to be cheaper.