The code would still take some time to use; and there would be hold ups in accessing the necessary equipment because remember, he was on the run from the police and he hadn't exactly wanted to 'make up' with Mycroft who could have helped with that.
But in essence he could have done a lot of things; but that would have been a boring story then.
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Also, please note that sentences can also end in full stops. The exclamation mark can be overused.
Sherlock Holmes 28 March 13:08
Mycroft’s popularity doesn’t surprise me at all. He is, after all, incredibly beautiful, clever and well-dressed. And beautiful. Did I mention that?
--Mark Gatiss
"I know that you believe you understand what you think I said, but I’m not sure you realize that what you heard is not what I meant."
Robert McCloskey