I know that in Africa, there is a culture of folks owning one phone but many SIM cards. One card is good for texting, one card is good for receiving calls, one card is best for calling one place and one card is best for a particular coverage in a particular area. I am fascinated by cellular, GSM, mobile, texting, and voice cultures around the world. Textually.org has a great article about the cell phone cultures of India and the Phillipines you should check out called Indians prefer phone calls to SMS:
For people in India, making a call has become the best option to connect, while other countries like to use the SMS to convey their message. 86 percent of Indians had either made or received a call in the past three months but Filipinos have not made or received a single phone call for the same period, instead they prefer the SMS. Silicon India reports.
The basic reason behind the preference of calls to SMS is the cost factor. The average tariff in India for local calls is Re 1, the same as the local SMS rate, while for STD calls, the average tariff is Rs.1.50 and the SMS rate is higher at Rs 2. Thus, SMS tariffs are either higher than voice rates or at best comparable, which makes the latter more lucrative.”The phone patterns in countries like Thailand and the Philippines are also very different as compared to, say, India, Pakistan and Bangladesh,” says Rohan Samarajiva, Chairman and CEO of Lirneasia and a former Srilankan telecom regulator told The Times of India. These findings are the result of a Sri Lankan study titled Teleuse@BOP 08-09 conducted by Asian ICT think-tank Lirneasia, which spanned across Bangladesh, Pakistan, Sri Lanka, Philippines and Thailand. The study surveyed close to 10,000 people from the low-income or Bottom of Pyramid group (earning less than $38 a month). In India, it was around 10 cities which were surveyed.
