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"Alternatives exists" sounds a lot like this fallacyThe fact that an argument is superficially similar to an informal fallacy doesn't make the argument inherently fallacious. You can easily construct a variation of the same conversation which is structurally identical but is obviously not fallacious—
Critic: "I want a banana, but I don't like the texture."
Respondent: "If you don't like them, don't eat them."
What the respondent said is only a fallacy if the purpose was to counter the criticism. But the criticism wasn't rejected. What was rejected was the unstated but implied assertion that the critic was entitled to a banana which satisfies them.
Now let's turn that into an "alternatives exist" argument and replay—
Critic: "I demand a banana that I do like."
Respondent: "I understand your desire for a banana which suits you. However nobody is obligated to supply you with such a banana. Thankfully, alternatives do exist, such as the nectarine."
That's not a fallacy. And it's not a fallacy to say that Apple is not obligated to make an iPhone which satisfies you. Especially because it's a statement of fact.
If you don't like that you can't buy an Apple branded dumbphone, and you have failed to convince Apple to make it for you, perhaps try lobbying your government? They could pass a law which requires smartphone makers to also sell dumbphones.