Purchased credits can be used for pay-per-use features and premium usage, but they do not convert a Free account into a Pro account or remove every Free-tier limit. If you want unlimited text in the app and higher image limits, that comes from a Pro, Pro+, or Max subscription rather than from purchased credits. If you see a daily limit message after buying credits, note the model and action you used, since some limits are expected for specific features.
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In the model selector, models are marked as Free, Pro, or pay-per-use. Pay-per-use models show a green credit icon, which means they draw from your credit balance rather than plan limits.