Can I text my friend's phone number with SMS and email with iMessage?
I recently started using an iPhone 4S - horribly out of date, I know, but I prefer its size and simplicity. I have limited SMS texting and no data plan, so I was hoping to be able to text via iMessage when connected to WiFi so I don't have to pay through the nose and automatically switch to SMS when I'm out of WiFi range. Unfortunately, when I try to text my friend (who has an iPhone and Mac) with iMessage turned on and "Send as SMS" on for when iMessage is unavailable, my phone always texts through iMessage even when I'm not connected to the internet at all. The texts I send when disconnected simply don't arrive until I connect again. I can only text my friend through SMS by selecting an unsent text and choosing "Send again as SMS", but then I have to clear the conversation and restart the phone in order to text through iMessage again.
What I want to know is, firstly are there solutions to this, and secondly, is it possible to split my friend's contact info into phone number and set that as SMS only, and email and set that as iMessage texting? Due to my phone being so old I can't download any other IM apps unfortunately. Thanks!
iPhone 4s, iOS 9