Dual-SIM mobile phones let you use two SIMs in a single phone. Most people who use dual-SIM phones find the functionality useful for mixing work and pleasure, rather than carrying separate phones for their work- and personal contacts.
Dual-SIM mobile phones are also useful for maintaining two personal contacts, however, whereby one might offer a good rate on calls and texts, and the other offers unlimited data. Or perhaps you frequently travel abroad, and would like to carry a dual SIM mobile phone for when you're at home and another
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