Unable to sign in to App Store says' Please contact iTunes Support to complete this transaction'

Re: So I got an old iphone 6+

Phone may need updating to the newest compatible iOS version: (Eg: via Settings > General .> Software updates)

About iOS 12 Updates - Apple Support says iOS 12.5.7

"This update provides important security updates and is recommended for all users."

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Re;"created a apple id..the problem is it wont let me sign into the app store without making a purchase in itunes "

Check you are signed in (to your device) with the Apple ID you will use for the App Store, (if not already done).

Sign in to your Apple Account - Apple Support

Because you created a new Apple ID:

Apple requires we have a payment method listed in an Apple ID account for the first time we use the App Store or iTunes., even if we only download free items. {Seems an actual purchase is not necessary)

See which payment methods Apple can accept in your country or region:

Payment methods that you can use with your Apple Account - Apple Support

How to Add an Apple ID Payment method:

Add a payment method to your Apple Account - Apple Support

You may need to allow 24 hours for updates to come into effect.

or

Restarting your device may help you view recent changes.

What to do: If you need to change or update your Apple Account payment method - Apple Support

or

How to delete an Apple ID payment method:

Remove a payment method from your Apple Account - Apple Support

IF needed: How to: Get a verification code and sign in with two-factor authentication - Apple Support

Get a verification code and sign in with two-factor authentication - Apple Support

More help or support:

(There are "Get Support" links as the bottom of the websites (links below) (ie online chat, phone, eMail)

Apple Account support / help website: Apple Account - Official Apple Support

For iTunes support and more:

Subscriptions and Billing Website: Subscriptions and Billing - Official Apple Support

You may need to have a payment method on file to download apps – even "free" ones.

You will not be charged just for downloading a "free" app.

Note that many "free" apps are like arcade games or vending machines that have functionality locked away behind "in-app purchases". If you make any of those "in-app purchases", those cost real money. Other apps might offer a "free trial" that signs you up for an automatically-renewing paid subscription that costs real money. If you fail to cancel the trial soon enough, you get charged for the subscription.

Try adding a payment method to your Apple Account, as explained above.

What should I do to use my apple store without making a purchase in iTunes