Sparrow is a fine software wallet, for sure. Packed with features, yet easy enough for anyone to use. I only wish they had a mobile version. I've found that for mobile, Nunchuk is the mskt secure, and most usable wallet. Mycelium is close #2 tho it doesn't support NFC signing. You have to do the QR thing which isn't the end of the world. The Electrum mobile wallet is good if you're accustomed to using Electrum desktop and want a similar companion app, but it's missing a lot of features that make Electrum great.