Recompile mobile app for android?

Question

Mobile development

Hello,
There is an apk for Android that provides telephony services and also UC with vendor software.
The problem is the following, when the application is activated, a data channel is detected, and in cases where Wi Fi is not detected, the application starts in an incomplete mode of operation.
Interested in the question:
1. The cost of studying the issue?
2. Cost of recompiling the application itself?
Thank you.

Answer 1

1. free of charge
2. according to the results of paragraph 1, we will agree
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