But you must remember that it is more easier talking in person than on the phone. Don't take phone calls too seriously. A lady might think she understands you, but there might be one word that she missed that makes the whole sentence different from what she thinks she heard. If your lady don't give you a phone number, don't think that she is lying to you or is not interested in you. Especially outside of the very big cities not everyone has a phone.
Phones are rather expensive to install sometimes.
Some of the ladies don't speak English and this is the only reason why they don't give their phone numbers. You can offer them to speak through 3-way translation services Remember that Russian ladies not often live in a separate appartment. If a man's voice answers the call, he is probably her father or brother. If her relatives don't speak English, learn a few Russian phrases. It's good and polite to agree about the time of your call in the letters and please check the time differences before you call.