Hi there, yes there are in fact smart phones out there which can accommodate at least three sim slots. I'll give you four examples of these phones.They are:
1. The Acer Liquid E700 - It 's a simple phone with 16 GB built-in memory. It's also available in the UK, America and some other countries.
2.ESON smart phone - Described as one of the best on the market and it's available on Amazon.
3.LG Optimus LII - Uses Android as its software and several attractive features.
4. Goo Phone X1- Made by Chine phone company GooPhone, it's operated by Android as well and has two cameras. Primary camera is 5 mega pixel and front camera is 2 mega pixel