What are certain multimedia messaging services?

[Multo]

English Language Tests, Intermediate level

ESL/EFL Test #161 "Mobile telecommunication expressions", question 10

Some hand phones are designed to be ......... with certain multimedia messaging services.

(a) communicable
(b) comfortable
(c) comparable
(d) compatible

English Language Tests, Intermediate level

ESL/EFL Test #161 "Mobile telecommunication expressions", answer 10

Some hand phones are designed to be compatible with certain multimedia messaging services.

Correct answer: (d) compatible
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what's the meaning of certain multimedia?also i want to know the meaning of certain restuarant,i see "certain" in deffrent sentence does it mean great?
Thanks in advance

[Beeesneees]

certain = 'particular' in this context.
certain restaurants - a particular selection of restaurants
certain multimedia messaging services - a particular format of multimedia messaging services

multimedia messaging services are services that allow a mixture of media such as text, voice and picture/photos to be sent in a message.
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Cheers m' dears!

[Saneta]

hand phones= cellphones or handset?

if cellphones, why only some hand phones are designed to be compatible with certain multimedia messaging services.?

thanks

[Beeesneees]

Probably cellphones, but these days some landline phones also have multimedia and messaging capabilities.
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Cheers m' dears!