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3GPP is now responsible for the further development of applications like SIM (TS 51.011) and ETSI for the further development of the physical card UICC.
The phones, which also usually include touch screen interfaces and other modern features, typically retail for a much lower price than branded models.
These applications communicate with the handset or a server using SIM Application Toolkit, which was initially specified by 3GPP in TS 11.14.
(There is an identical ETSI specification with different numbering.) ETSI and 3GPP maintain the SIM specifications.
A dual SIM mobile phone is one that holds two SIM cards.
Dual SIMs are popular in locations where lower prices apply to calls between clients of the same provider; they also allow separate numbers for personal and business calls on the same handset.