I have a 'home' android mobile phone which I use for any Android earning apps or if available on both I have the IOS and Android version just using the same account.
My Android home one has a better camera than my iPhone so I tend to use my Android one for the apps that pay to upload receipts.
Only a cheap OUKITEL from eBay but it has a 13 megapixel camera.
Shopprize is Android only but you can easily get £10 a month in Amazon's Gift Cards or more if you have allot of receipts and open up the app daily to get the free bonus coins.
ReceiptHog is allot slower so haven't cashed out there yet. Probably averaging around £2 a month for me.
With these paid to upload your receipts how much you earn will be dependant on how many receipts you upload daily/weekly.
Worth sometimes just trying the apps out to see whether it is worthwhile using or not.
Shoppix is IOS and Android but only joined recently as it is new but that looks so far that is going to to be around £2 a month so again earning more cash from my receipts.
OnePulse is for both and is slower but again just quick pulses to answer taking a few seconds it is easy to earn from. £5 minimum payout takes awhile but all the Pulses are decent pay and you earn more as you move up their level system.
Citizenme again quick polls to answer takes seconds and that is paid instantly and automatically.