Is it permissible to deposit money in Islamic banks, especially if they are branches of interest-based (usurious) banks, and what is the ruling on using mobile payment wallets provided by telecommunication companies that cooperate with interest-based banks for bill payments and online purchases?

The summary answers a question about choosing Islamic banks and mobile payment services. One should choose Islamic banks or branches that are reputable in adhering to Sharia (definition) controls, and this can be ascertained by asking specialized scholars. As for mobile payment services, there is no harm in them if the user adheres to the limits of their balance and pays the corresponding fees for the service.